【弯道超车】Unit 4 Changing and Growing 核心语法之used to 的用法-2026-2027学年仁爱科普版(新教材)八年级英语上册精讲精练 (含答案解析)

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【弯道超车】Unit 4 Changing and Growing 核心语法之used to 的用法-2026-2027学年仁爱科普版(新教材)八年级英语上册精讲精练 (含答案解析)

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/ 让学习更有效 新课备课备考 | 英语学科
/ 让学习更有效 新课备课备考 | 英语学科
2026-2027学年仁爱科普版八年级英语上册核心语法精讲精练
(新教材)Unit 4 Changing and Growing
核心语法:used to的用法
一、核心概念
used to 表示过去经常做某事或存在某种状态,但现在不再如此了。它强调过去 vs 现在的对比。
核心含义: “过去常常……(但现在不了)”
示例:
I used to get up late, but now I get up early.(我过去常常晚起,但现在早起。)
There used to be a park here.(这里过去有一个公园。)
二、基本结构
1. 肯定句
结构: 主语 + used to + 动词原形
I used to play basketball after school.(我过去放学后常常打篮球。)→ 现在不打了
He used to be very shy.(他过去很害羞。)→ 现在不害羞了
There used to be a cinema near here.(这里过去有一家电影院。)→ 现在没有了
2. 否定句
两种形式:
主语 + didn't use to + 动词原形(更常见,口语)
主语 + used not to + 动词原形(较正式,书面)
例句:
I didn't use to like coffee, but now I do.(我过去不喜欢咖啡,但现在喜欢了。)
She used not to eat vegetables.(她过去不吃蔬菜。)→ 现在吃了
3. 疑问句
两种形式:
Did + 主语 + use to + 动词原形?(更常见)
Used + 主语 + to + 动词原形?(较正式,英式英语)
例句:
Did you use to have long hair (你过去留长发吗?)
Used he to live in Shanghai (他过去住在上海吗?)
4. 简短回答
Did you use to swim every day
Yes, I did. / No, I didn't.
Used she to play the piano
Yes, she used to. / No, she used not to.
三、三种易混结构辨析(重中之重!)
结构 含义 用法 例句
used to do 过去常常做(现在不做了) to 是不定式符号,后接动词原形 I used to get up late.
be/get used to doing 习惯于做某事 to 是介词,后接动名词 I am used to getting up early.
be used to do 被用来做某事 被动语态,后接动词原形 Wood is used to make paper.
详细辨析:
1. used to do(过去常常)
表示过去的习惯或状态,强调与现在的对比
只能用于过去时
后接动词原形
中文:“过去常常……”
2. be/get used to doing(习惯于)
表示习惯于某事
to 是介词,后接名词、代词或动名词
可用于各种时态
中文:“习惯于……”
对比例句:
I used to live in the countryside.(我过去住在农村。)→ 现在不住了
I am used to living in the city.(我习惯了城市生活。)→ 现在习惯
3. be used to do(被用来)
表示被用来做某事
是被动语态
to 后接动词原形
中文:“被用来……”
例句:
This knife is used to cut bread.(这把刀被用来切面包。)
四、used to 的使用要点
1. 只用于过去,不用于现在
I use to go swimming.
I used to go swimming.(过去常常)
I usually go swimming.(现在常常)
2. 可与频度副词连用
I often used to visit my grandparents.(我过去经常看望祖父母。)
He always used to be the first to arrive.(他总是第一个到。)
3. 可与过去时间状语连用
I used to play tennis when I was in middle school.(我中学时常常打网球。)
There used to be a river here ten years ago.(十年前这里有条河。)
4. 描述过去状态
不仅可以表示动作,还可以表示状态
She used to be thin.(她过去很瘦。)
People used to think the earth was flat.(人们过去认为地球是平的。)
五、与一般过去时的区别
区别点 used to do 一般过去时
强调重点 强调过去的习惯或状态,且与现在对比 只陈述过去事实
时间状语 常与频度副词连用 可与具体时间连用
隐含对比 强烈暗示“现在不了” 无此暗示
描述状态 常描述过去的状态 多描述过去的动作
对比例句:
I used to smoke.(我过去吸烟。)→ 暗示现在不吸了
I smoked a cigarette yesterday.(我昨天吸了支烟。)→ 只陈述事实
He used to live in Beijing.(他过去住在北京。)→ 现在不住了
He lived in Beijing for two years.(他在北京住了两年。)→ 可能现在还住
六、思维导图总结
七、记忆口诀
used to 辨析口诀:
used to do 表过去,习惯状态今已无;
didn't use to 是否定,Did...use to 是疑问。
be used to doing 异,to 是介词后接-ing;
表示习惯某事物,现在适应记心里。
be used to do 用途明,被动语态物做宾;
三句结构形相近,含义用法要分清。
1.The wooden box ________ hold old books years ago, but my grandpa ________ putting his tea sets in it now.
A.used to; gets used to B.was used to; gets used to
C.used to; used to D.was used to; used to
2.Mr White used to ________ with friends on the phone, but now he is used to ________ online.
A.talk; talking B.talk; talk C.talking; talking D.talking; talk
3.My father _______ to his workplace by bus, but now he _______ there by bike.
A.used to go; is used to go
B.used to going; is used to go
C.used to go; is used to going
4.I used to ________ at seven, but now I am getting used to ________ at half past six.
A.getting up; get up B.got up; getting up C.got up; get up D.get up; getting up
5.My mother ________ have short hair, but her hair is long now.
A.was used to B.is used to C.used to
6.I _______ to school by bike, but now I walk because I live nearby.
A.used to go B.am used to going
C.used to going D.was used to go
7.My mother used to ________ the song My Heart Will Go On. But now she is used to ________ it.
A.hate; listening to B.hated; listened to C.hating; listen
8.My grandma used to ________ chess with her friends in the park, but now she prefers square dancing.
A.play B.playing C.played
9.My father ________ go to work by car, but now he takes the bus.
A.used to B.is used to C.uses to D.was used to
10.—I hear that your good friend David used to ________ books about history.
—Yes, but now he is used to ________ novels about amazing natural wonders.
A.read; reading B.reading; reading C.read; read D.reading; read
11.Scientists used ________ that ants came from the northern half of the earth.
A.believe B.to believe C.believing D.believed
12.My grandparents used ________ in the countryside when they were still young.
A.live B.lived C.living D.to live
13.Scientists used ________ that ants came from the northern half of the earth.
A.believe B.to believe C.believed D.believing
14.Alina ________ work on a farm, but now she ________ at school with the help of UNICEF.
A.used to; is used to study B.was used to; is used to studying
C.was used to; is used to study D.used to; is used to studying
15.My grandfather ________ live in the countryside, but he has ________ the city life now.
A.used to; got used to B.got used to; used to
C.used to; used to D.got used to; got used to
16.My grandfather ________ live in the countryside, but now he ________ the life in the city.
A.used to; used to B.is used to; used to
C.used to; is used to D.is used to; is used to
17.—I used to ________ to loud music in my spare time.
—Oh, it may hurt your hearing, but I get used to ________ soft music.
A.listen, enjoy B.listening, enjoying C.listen, enjoying
18.When I was a little girl, I ________ sit by the window and watch the rain with my grandma.
A.would B.used to C.was used to D.A and B
19.I ________ like drinking milk, but now I have it every morning because it’s good for my health.
A.didn’t used to B.used not to C.didn’t use to D.B and C
20.You will soon ________ the life in the boarding school if you try to make more friends.
A.used to B.be used to C.be used for D.use to
21.My cousin ________ walk to school, but now she ________ riding a shared bike (共享单车).
A.used to; is used to B.is used to; used to
C.used to; used to D.is used to; is used to
22.—________ you ________ play computer games till midnight when you were in primary school —No, never. My parents were very strict with me.
A.Did; used to B.Used; to C.Did; use to D.B and C
23.He used to ________ in the city, but now he is used to ________ in the village.
A.live; live B.living; live C.live; living D.living; living
24.There ______ many small factories near this river, but now there’re green trees and open spaces for people to have fun.
A.was used to be B.was used to have C.used to have D.used to be
25.He ________ go to the park for a walk, but now he ________ staying at home.
A.used to; used to B.is used to; used to C.used to; is used to D.is used to; is used to
26.She ______ think her birthmark was ugly, but now she loves it.
A.used to B.uses to C.is used to D.was used to
27.—Why tomatoes again I really get bored with them.
—Well, I thought you liked them. You ________ them after all.
A.used to eat B.used to eating C.were used to eat D.are used to eat
28.Sally ______ her long hair to cover the birthmark before she met Maddie.
A.used to keep B.has kept C.keeps
29.My grandfather ________ live in the countryside, but now he has moved to the city.
A.used to B.was used to C.got used to D.use to
30.—Did you use to ________ early
—No, I always got up late before.
A.get up B.getting up C.got up D.be getting up
31.My mother used to ________ a bike to work, but now she is used to ________ the bus.
A.ride; take B.riding; taking C.ride; taking D.riding; take
32.My grandfather ________ live in the countryside, but now he gets used to the city life.
A.used to B.is used to C.has used to D.was used to
33.One of the volunteers ________ live in a quiet town, but now he ________ the busy life in London.
A.used to; gets used to B.gets used to; used to C.used to; used to D.gets used to; gets used to
34.My father ________ drink coffee, but now he likes tea.
A.used to B.is used to C.was used to D.is used for
35.He used ______ up late, but now he is used ______ up early.
A.to stay; to getting B.to stay; to get C.staying; to getting D.staying; to get
36.My brother ________ short, but now he is tall and strong.
A.used to be B.was used to be C.used to D.be used to being
37.—How do you go to work, Tom
—I ________ go to work by bus in the past, but now I like riding a bike.
A.am used to B.used to C.use to
38.He used to ________ in a small town, but now he lives in a big city.
A.live B.lives C.lived D.living
39.I ________ to have a pet cat, but now I don’t.
A.use B.used C.am used D.was used
40.She ________ be shy, but now she can give speeches in front of the whole school.
A.uses to B.used to C.was used to
41.The city square ________ be a small dirty park, but now it is clean and beautiful.
A.used to B.uses to C.is used to D.was used to
42.Did you ________ play basketball after school
A.used to B.use to C.using to D.are used to
43.She ________ to be scared of the dark, but now she is used to walking alone at night.
A.uses B.is used C.used
44.He ______ play basketball after school, but now he ________ volunteer work.
A.used to; is used to doing B.was used to; used to do
C.used to; is used to do D.was used to; is used to doing
45.My brother used to ________ shy, but now he is more outgoing after joining volunteer groups.
A.be B.being C.been D.is
46.It took me a while to ________ up early in the morning, but now I feel energetic all day.
A.used to get B.be used to get C.get used to getting D.use to getting
47.—How do you get to school every day
—I used to ________ a bus to school, but now I am used to ________ to school.
A.take; walk B.take; walking
C.taking; walk D.taking; walking
48.He ________ walk to school, but now he rides a bike.
A.uses to B.is used to C.used to D.was used for
49.My uncle ________ work in the city, but now he volunteers in villages.
A.use to B.is used to C.was used for D.used to
50.Shenzhen ________ a fishing village, but now it is a top high-tech city.
A.used to B.was used to be C.used to be D.used to being
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参考答案及试题解析
1.A
【解析】句意:这个木盒子多年前用来存放旧书,但我爷爷现在习惯把茶具放在里面。
used to表示“过去常常”,后接动词原形;be used to do sth.表示“被用来做某事”,to后接动词原形;be/get used to doing sth.表示“习惯于”,to是介词,后接动名词。第一空后为动词原形hold,结合时间“years ago”可知,表示过去常常存放旧书,用used to;第二空后为动名词putting,结合“now”可知,表示现在习惯放置茶具,用gets used to。
2.A
【解析】句意:怀特先生过去常常和朋友打电话聊天,但现在他习惯了在线聊天。
used to do sth.意为“过去常常做某事”,后接动词原形talk;be used to doing sth.意为“习惯于做某事”,to为介词,后接动名词talking。
3.C
【解析】句意:我父亲过去常乘公共汽车去上班,但现在他习惯骑自行车去那里。
used to do sth.过去常常做某事;be used to doing sth.习惯于做某事。根据前半句语境可知表示过去常常乘公共汽车,应用used to go;根据后半句“now”可知表示现在习惯骑自行车,应用is used to going。应填used to go; is used to going。
4.D
【解析】句意:我过去常常七点起床,但现在我正习惯六点半起床。
used to do sth.“过去常常做某事”,to后接动词原形;be/get used to doing sth.“习惯做某事”,to为介词,后接动名词。第一空表示“过去常常七点起床”,用get up;第二空表示“习惯六点半起床”,用getting up。
5.C
【解析】句意:我妈妈以前留短发,但现在她的头发很长。
used to后接动词原形,表示过去常常或过去的状态;be used to后接动名词,表示习惯于做某事。根据后半句“but her hair is long now”可知前半句描述过去的状态,且空后为动词原形have,符合used to的用法。
6.A
【解析】句意:我过去常常骑自行车上学,但现在我走路,因为我住在附近。
used to do过去常常做某事;be used to doing习惯于做某事;be used to do被用来做某事。句中but now表示今昔对比,表达过去的行为,需用used to go。
7.A
【解析】句意:我妈妈过去讨厌歌曲My Heart Will Go On,但现在她习惯听这首歌了。
hate讨厌;listen to听;listen听。 结合语句“My mother used to…the song My Heart Will Go On. But now she is used to…it”可知,used to后接动词原形,表示“过去常常做某事”;be used to后接动名词,表示“习惯于做某事”;前者用动词原形,后者用动名词形式。listen是不及物动词,后接宾语必须搭配介词to。
8.A
【解析】句意:我奶奶过去常常在公园里和朋友下棋,但现在她更喜欢跳广场舞。
play玩/下(棋);playing动名词形式;played过去式。used to后接动词原形,表示“过去常常做某事”,强调过去的习惯,此处应填动词原形。
9.A
【解析】句意:我爸爸过去常常开车上班,但现在他坐公交。
used to过去常常;is used to习惯于,to是介词,后面要加名词或动名词;uses to无此搭配;was used to 被用来(过去式)。固定搭配used to do sth.表示“过去常常做某事”,后接动词原形go,符合本句“but now”今昔对比的语境。
10.A
【解析】句意:——我听说你的好朋友大卫过去常常读关于历史的书。——是的,但现在他习惯于读关于神奇自然奇观的小说了。
used to do sth.过去常常做某事,后接动词原形;be used to doing sth.习惯于做某事,to为介词,后接动名词。根据第一空前的“used to”可知此处指过去常常,用动词原形read;根据第二空前的“is used to”及时间状语“now”可知此处指现在的习惯,用动名词reading。
11.B
【解析】句意:科学家过去认为蚂蚁起源于地球的北半部分。
句中“used...”提示此处考查短语used to do sth.表示“过去曾经/过去常常做某事”,后接动词不定式。应填to believe。
12.D
【解析】句意:我的祖父母过去住在乡下当他们还年轻时。
根据题干中“used...”及时间状语“when they were still young”可知,此处表示“过去常常做某事”,应用结构used to do sth.,后接动词不定式to live。
13.B
【解析】句意:科学家们过去相信蚂蚁来自地球的北半球。
used to后接动词原形,意为“过去常常”,表示过去的状态或习惯。句中“used”已给出,空缺处需填to believe以构成完整结构。
14.D
【解析】句意:阿丽娜过去常在农场工作,但现在在联合国儿童基金会的帮助下,她习惯于在学校学习。
used to do sth.意为“过去常常做某事”;be used to doing sth. 意为“习惯于做某事”,其中to是介词,后接动名词。根据前半句语境可知表示过去的状态,用used to;后半句表示现在习惯于学习,用is used to studying。
15.A
【解析】句意:我爷爷过去常常住在乡下,但现在他已经习惯了城市生活。
used to do sth.过去常常做某事;get used to sth.习惯于某事。第一空后接动词原形live,指过去的状态,用used to;第二空根据has可知为现在完成时,指现在已习惯,用got used to。故选A。
16.C
【解析】句意:我爷爷过去住在乡下,但现在他习惯了城市生活。
used to do sth.表示 “过去常常做某事”;be used to sth.表示 “习惯于某事”。第一空表过去的状态,用used to;第二空表现在的习惯,用is used to。
17.C
【解析】句意:——我过去在业余时间常常听吵闹的音乐。——哦,那可能会伤害你的听力,但我习惯了享受轻柔的音乐。
used to do sth.意为“过去常常做某事”,后接动词原形listen;get used to doing sth.意为“习惯于做某事”,to为介词,后接动名词enjoying。
18.D
【解析】句意:当我还是个小女孩时,我常常和奶奶一起坐在窗边看雨。
would过去常常(强调过去习惯性动作);used to过去常常(强调过去的状态或动作,且现在已不如此);was used to习惯于。would和used to均可表示过去的习惯性动作,used to强调过去与现在的对比(现在不再这样),would仅描述过去重复的动作。根据语境,此处两者均可使用。故选D。
19.D
【解析】句意:我过去不喜欢喝牛奶,但现在我每天早上都喝,因为它对健康有益。
didn’t used to形式错误;used not to过去不常做某事;didn’t use to过去不常做某事。根据后半句“ but now I have it every morning”可知,过去不喜欢喝牛奶。used to do sth意为“过去常常做某事”。否定形式有两种正确写法:didn’t use to do和used not to do。因此选项B和C都正确。
20.B
【解析】句意:如果你试着多交些朋友,你很快就会习惯寄宿学校的生活。
used to(过去常常,后接动词原形);be used to(习惯于,后接名词/动名词);be used for(被用于……,表用途);use to(语法错误,无此搭配)。句中the life是名词,结合语境表达“习惯寄宿生活”,will后接动词原形,因此用be used to。
21.A
【解析】句意:我表妹过去常常步行上学,但现在她习惯骑共享单车了。
used to do过去常常做某事;is used to doing习惯于做某事。结合“walk to school, but now she…riding”可知,第一空表“过去常常”用used to;第二空表“习惯于”且后接动名词,用is used to。应填入used to;is used to。
22.D
【解析】句意:——你上小学时常常玩电脑游戏到半夜吗?——从来没有。我的父母对我非常严格。
含有used to do的一般疑问句式有两种形式:Did sb. use to do和Used sb. to do,因此选项BC都对,故选D。
23.C
【解析】句意:他过去常常住在城市,但现在他习惯住在乡村了。
used to do sth.意为“过去常常做某事”,后接动词原形;be used to doing sth.意为“习惯于做某事”,后接动名词。根据语境,第一空表示“过去常常”,应用动词原形live,第二空表示“习惯于”,应用动名词living。
24.D
【解析】句意:这条河附近过去曾经有许多小工厂,但现在有了绿树和开放空间供人们娱乐。
used to do sth.是固定用法,意为“过去常常做某事”,后接动词原形;There be句型表示“有”,不能与have连用。根据“but now”可知是过去与现在的对比,表示过去曾经有,应用There used to be结构。
25.C
【解析】句意:他过去常常去公园散步,但现在他习惯于待在家里。
used to do sth. 表示“过去常常做某事”,后接动词原形;be used to doing sth. 表示“习惯于做某事”,后接动名词。根据前半句“go”为动词原形可知第一空填 used to;根据后半句“now”及“staying”为动名词可知第二空填 is used to。
26.A
【解析】句意:她过去认为她的胎记很难看,但现在她喜欢它了。
used to do sth.过去常常做某事,强调过去与现在的对比;uses to无此固定搭配;be used to do sth.被用来做某事,是被动语态。根据句中“but now she loves it”可知,此处表示她过去认为她的胎记很难看,used to符合语境。
27.A
【解析】句意:——为什么又是西红柿?我真的厌倦它们了。——嗯,我以为你喜欢它们。毕竟你以前常吃它们。
used to eat过去常常吃;be used to eating习惯于吃;were used to eat被用来吃;are used to eat被用来吃。根据前句“I thought you liked them”可知,此处表示“过去常常吃”,暗含现在不吃了的意思,应填used to eat。
28.A
【解析】句意:Sally以前留长发来遮盖胎记,在她遇见Maddie之前。根据“before she met Maddie”可知这是过去的习惯或状态,现在已不再如此,used to do表示“过去常常”,因此选A。
29.A
【解析】句意:我祖父过去住在农村,但现在他搬到了城市。
used to过去常常;was used to习惯于/被用来;got used to习惯于;use to形式错误。根据“but now he has moved to the city”可知,前后形成对比,前句描述过去的状态,且live为动词原形,应用used to do sth.结构。故选A。
30.A
【解析】句意:——你过去常常早起吗?——不,我以前总是起得很晚。
used to do sth.表示“过去常常做某事”,后接动词原形。根据“Did you use to”可知,该结构用于一般疑问句中,因此空处应填动词原形get up。
31.C
【解析】句意:我妈妈过去常常骑自行车上班,但现在她习惯乘公共汽车了。
used to do sth.意为“过去常常做某事”,后接动词原形;be used to doing sth.意为“习惯做某事”,后接动名词。根据题干可知,第一空表示过去常常,用ride;第二空表示现在习惯乘公共汽车,用taking。
32.A
【解析】句意:我爷爷过去常常住在农村,但现在他习惯了城市生活。
used to do sth.意为“过去常常做某事;be used to do sth.意为“被用来做某事”;get/be used to doing sth.意为“习惯于做某事”,has used to搭配错误。根据“but now he gets used to the city life”可知,此处是表达“爷爷过去常常住在农村”,用used to do sth.表达。
33.A
【解析】句意:其中一名志愿者过去住在安静的小镇,但现在他习惯了伦敦忙碌的生活。
第一空表示“过去经常/过去习惯于”,用used to do sth.;第二空表示“现在习惯了”,用get used to sth./doing sth.,主语是he,且由now可知用一般现在时gets used to。
34.A
【解析】句意:我父亲过去常常喝咖啡,但现在他喜欢喝茶。
“used to”意为“过去常常(做某事)”,后接动词原形;“is used to”意为“习惯于”,后接名词、代词或动词-ing形式;“was used to”意为“过去习惯于”;“is used for”意为“被用来做……”。根据“My father…drink coffee, but now he likes tea.”可知,此处指父亲过去的一种习惯。空后“drink”为动词原形,应用短语“used to”。
35.A
【解析】句意:他过去常常熬夜,但是现在他习惯早起。
used to do sth.表示“过去常常做某事”;be used to doing sth.表示“习惯于做某事”,to为介词,后接动名词形式。结合语境和固定搭配,第一空填不定式to stay,第二空填to getting。
36.A
【解析】句意:我哥哥过去很矮,但现在他又高又壮。
根据“but now”可知前后表示对比,前半句描述过去的状态。used to be意为“过去曾经/过去常常”,short是形容词,需要和be动词连用,因此used to be符合结构和句意。was used to be结构错误,be used to表示“习惯于”时,to是介词,后面必须接动名词,不能接动词原形be;used to后不能直接加形容词short,缺少be动词;be used to being意为“习惯于成为……”,不符合原句今昔对比的句意。
37.B
【解析】句意:——汤姆,你怎么去上班?——我过去常常乘公交车去上班,但现在我喜欢骑自行车。
根据“in the past”和“but now”可知,此处表示过去常常做某事,而现在不再做了。故选B。
38.A
【解析】句意:他过去住在一个小镇上,但现在他住在一个大城市里。
根据“He used to…in a small town”可知,此处为固定短语used to do sth.,意为“过去常常做某事”,后接动词原形。应填live。
39.B
【解析】句意:我过去养过一只宠物猫,但现在不养了。
use使用;used to do sth.过去常常做某事;am used to doing sth.习惯于做某事;was used to do sth.被用来做某事。根据“but now I don’t”可知,表示过去的状态与现在对比。应填used。
40.B
【解析】句意:她过去很害羞,但现在她可以在全校面前演讲
used to do sth.表示“过去常常做某事”或“过去是某种状态”,后接动词原形;be used to doing sth.表示“习惯于做某事”,后接动名词。根据“but now”可知,此处表示过去的状态与现在形成对比,且空后为动词原形be,应填used to。
41.A
【解析】句意:城市广场过去是一个又小又脏的公园,但是现在它很干净漂亮。
used to过去……;uses to是不合理搭配,可以排除;is used to现在习惯于……;was used to过去习惯于……。根据“城市广场过去是一个又小又脏的公园”,应该用used to。
42.B
【解析】句意:你过去常常放学后打篮球吗?
used to意为“过去常常”,变一般疑问句时借助助动词did,结构为“Did+主语+use to+动词原形”。句中已出现助动词Did,后面动词use需用原形,填use to。
43.C
【解析】句意:她过去害怕黑暗,但现在她习惯独自在夜间行走了。
uses使用;is used被用来/习惯于;used过去常常。be used to doing表示习惯于,但此处结构不对。根据“but now”可知,前后句意形成对比,前半句表示过去的状态,应用used to do sth.结构。
44.A
【解析】句意:他过去常常放学后打篮球,但是现在他习惯做志愿工作了。
根据“but now” 可知是过去和现在生活习惯对比,前半句表示过去,用“used to + 动词原形”表示“过去常常做某事”,故填used to;后半句表示现在习惯……,“be used to doing sth.”表示“习惯于做某事”,符合语境。
45.A
【解析】句意:我哥哥过去很害羞,但自从加入志愿者组织后,他变得更加开朗了。
used to do sth.是固定搭配,意为“过去常常做某事”,符合“过去害羞现在变得开朗”的语境。
46.C
【解析】句意:花费了我一段时间才习惯早上早起,但现在我整天都精力充沛。
used to do something表示过去常常做某事;be/get used to doing something表示习惯于做某事。根据“It took me a while”可知此处强调花费时间去适应的过程,且to为介词后接动名词getting,应用get used to getting,应选C。
47.B
【解析】句意:——你每天怎么去学校?——我过去常常乘公共汽车去学校,但现在我习惯于步行去学校。
used to do sth.意为“过去常常做某事”,不定式符号to后接动词原形;be used to doing sth.意为“习惯于做某事”,to是介词,后接动名词。根据语境,第一空表示过去常常乘公共汽车去学校,用动词原形take;第二空表示现在习惯于步行,用动名词walking。
48.C
【解析】句意:他过去常常步行去上学,但现在他骑自行车。
uses to无此用法;is used to习惯于,后接动名词;used to过去常常;was used for被用于。根据“but now he rides a bike”可知,前后形成对比,表示过去的习惯,且空后“walk”为动词原形,用used to。
49.D
【解析】句意:我的叔叔过去曾在城市工作,但现在他在村庄做志愿者。
used to do sth.表示“过去常常做某事”,be used to doing sth.表示“习惯于做某事”。根据“but now”可知前后是过去与现在的对比,且空后是动词原形work,符合used to do结构,故填used to。
50.C
【解析】句意:深圳过去是一个渔村,但现在它是一个顶尖的高科技城市。
根据后半句“but now it is…”可知,此处强调过去与现在的对比,应用used to be“过去是”,后接动词原形。A项缺少系动词;B项结构错误;D项to后接了动名词。
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