Unit 5 Our neighbourhood 语法专项课件(共30张PPT)—— Can , Could 表能力冀教版英语七年级下册

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Unit 5 Our neighbourhood 语法专项课件(共30张PPT)—— Can , Could 表能力冀教版英语七年级下册

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(共30张PPT)
教学课件
冀教英语七年级下册
Unit5 语法专项—— Can / Could 表能力
全解精讲+分层练习
学习目标
1.掌握 can 表示现在能力的用法
2.掌握 could 表示过去能力的用法
3.熟练运用肯定、否定、疑问句式
4.区分 could 表过去能力与委婉请求
5.能在语境中正确使用 can / could
什么是情态动词
1.情态动词表示语气、能力、许可等
2.can / could 是最常用的能力类情态动词
3.后面必须接动词原形
4.没有人称和数的变化
5.不能单独作谓语,需搭配实义动词
6.变否定/疑问无需助动词
can 的核心含义
1.用于一般现在时
2.表示现在具备的能力
3.可表示请求、允许
4.无人称变化:he/she/it 都用 can
5.否定形式:can’t = cannot
6.例句:I can speak English.
could 的核心含义
1.是 can 的过去式
2.表示过去具备的能力
3.可用于现在时的委婉请求
4.表过去能力常配过去时间状语
5.否定形式:couldn’t = could not
6.无人称变化, 例句:He could swim at
can 肯定句
1.结构:主语 + can + 动词原形
2.表示现在能做某事
3.动词永远用原形,不加 s/es
4.主语无论单复数都用 can
5.常见时间标志:now, today
例句:She can dance very well.
can 否定句
1.结构:主语 + can’t + 动词原形
2.can’t = cannot
3.表示现在不能/不会做某事
4.动词保持原形不变
例句:I can’t play the piano.
注意:不使用 don’t/doesn’t
can 一般疑问句
1.结构:Can + 主语 + 动词原形?
2.把 can 提到主语前面
3.肯定回答:Yes, 主语 + can.
4.否定回答:No, 主语 + can’t.
例句:Can you swim 回答:Yes, I can. / No, I can’t.
can 特殊疑问句
1.结构:疑问词 + can + 主语 + 动词原形?
2.常用疑问词:what, who, where
3.用来询问“能做什么”
4.例句:What can you do 回答:I can sing.
疑问词后直接跟 can,不加助动词
could 表过去能力—肯定句
1.结构:主语 + could + 动词原形
2.表示过去能做某事
3.常搭配过去时间状语
4.动词用原形
例句:He could read when he was 4.
时间标志:when…was/were, last…
could 表过去能力—否定句
1.结构:主语 + couldn’t + 动词原形
2.couldn’t = could not
3.表示过去不能/不会做某事
4.动词保持原形
例句:She couldn’t ride a bike before.
不使用 didn’t 辅助否定
could 一般疑问句(过去能力)
1.结构:Could + 主语 + 动词原形?
2.询问过去是否有某种能力
3.肯定回答:Yes, 主语 + could.
4.否定回答:No, 主语 + couldn’t.
例句:Could you walk at one 回答:Yes, I could.
could 特殊疑问句(过去能力)
1.结构:疑问词 + could + 主语 + 动词原形?
2.询问过去能做什么
例句:What could she do at 6 回答:She could draw.
时间状语常放句末
动词始终用原形
用法要点1
1.can / could 后永远接动词原形
2.不随主语变化:I/you/he 都一样
3.不能说:cans / coulds
4.不能说:can to do / could to do
错误:He cans swim.
正确:He can swim.
用法要点2
1.could 表过去能力要配过去时间
2.常见标志:when he was young
3.标志:last year / last term
4.标志:at the age of…
5.无过去时间,常表委婉请求
例句:I couldn’t fly kites last year.
用法要点3
1.could 表委婉请求(现在时)
2.比 can 更礼貌
3.句型:Could you…
4.回答只能用 can,不用 could
例句:— Could you help me — Yes, I can. / No, I can’t.
项目 can could
时态 现在时 过去式/委婉现在
能力 现在能力 过去能力
请求 直接 委婉礼貌
否定 can’t couldn’t
can vs could 核心对比
关键词时间标志
1.用 can:now, today, at present
2.用 could:when…was/were, last week/year/term
3.用 could:before, in the past, at the age of + 数字
委婉请求:Could you… 回答一律用 can
易混点提醒
1.could 不总是过去式
2.表请求时是现在时
3.表过去能力才是过去时
4.回答请求不用 could 不能说:Yes, I could.
5.否定请求:No, I can’t.
基础小练1(填空)
1.I __________ (can/could) swim now.
2.He __________ (can’t/couldn’t) walk last year.
3.__________ (Can/Could) you play chess
4.What __________ you do last summer
5.She __________ dance at 3.
6.They __________ find the way yesterday.
can
couldn’t
Can
could
could
couldn’t
基础小练2(句型转换)
1.I can cook.(否定句)
2.He could run fast.(一般疑问句)
3.She can sing.(对划线提问)
4.They could swim.(否定句)
5.Can you dance (肯定回答)
6.Could you help me (回答)
I can’t cook.
Could he run fast
What can she do
They couldn’t swim.
Yes, I can.
Yes, I can.
单项选择
1.— ____ you help me — Yes, I ___. A. Could; can B. Can; could
2.He ___ ride a bike last year. A. can B. could
3.What ___ you do now A. can B. could
4.She ___ speak Japanese before. A. couldn’t B. can’t
5.___ you swim at 5 A. Could B. Can
A
B
A
A
A
单项选择
6.I ___ play the piano now. A. can B. could
7.They ___ finish it yesterday. A. can’t B. couldn’t
8.— Could you open the door — Yes, ___. A. I can B. I could
9.He ___ draw when he was 6. A. can B. could
10.What ___ she do last term A. can B. could
A
B
A
B
B
用所给词适当形式填空
1.He can ____________ (swim) very well.
2.They could ____________ (play) basketball.
3.Can you ____________ (dance)
4.What could she ____________ (do) at 7
5.I can’t ____________ (fly) a kite.
swim
play
dance
do
fly
用所给词适当形式填空
6.She couldn’t ________ (write) last year.
7.Could you ________ (help) me
8.He can ________ (cook) noodles.
9.They couldn’t ________ (find) it.
10.What can you ________ (see)
write
help
cook
find
see
句型转换—否定句
1.I can speak English.
2.He could play football.
3.She can sing songs.
4.They could read books.
5.We can draw pictures.
6.You can help me.
I can’t speak English.
He couldn’t play football.
She can’t sing songs.
They couldn’t read books.
We can’t draw pictures.
You can’t help me.
句型转换—一般疑问句
1.He can jump high.
2.They could run fast.
3.She can dance well.
4.I can cook food.
5.I could swim.
6.We can fly kites.
Can he jump high
Could they run fast
Can she dance well
Can you cook food
Could you swim
Can you fly kites
句型转换—特殊疑问句
1.I can play the guitar.(划线提问)
2.He could draw at 5.(划线提问)
3.She can sing.(划线提问)
4.They could swim.(划线提问)
5.We can run.(划线提问)
6.You can cook.(划线提问)
What can you do
What could he do
What can she do
What could they do
What can you do
What can you do
课堂总结
1.can:现在能力、直接请求
2.could:过去能力、委婉请求
3.后接动词原形,无人称变化
4.否定:can’t / couldn’t
5.疑问:把 can/could 提前
6.委婉请求回答用 can
教学课件
Unit5 语法专项—— Can / Could 表能力
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