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七年级英语下册Unit3语法讲义
系动词
系动词本身有词义，但不能单独作谓语，后面需要接形容词、名词或代词等作表语，用来描述人或事物的状态、特征或变化。
常见系动词分类：
be 动词：am, is, are, was, were
感官系动词：feel, taste, look, smell, sound
变化系动词：go, get, become
保持系动词：remain
二、核心系动词精讲
1. be 动词
含义：表示 “是、在”，是最基础的系动词。
结构（挖空填写）：
肯定句：主语 + be + 表语（形容词 / 名词）
否定句：主语 + be + not + 表语
疑问句：Be + 主语 + 表语？
2. 感官系动词
feel：摸起来；感觉
taste：尝起来
look：看起来
smell：闻起来
sound：听起来
结构（挖空填写）
肯定句：主语 + 感官系动词 + 形容词
否定句：主语 + do /does + not + 感官系动词 + 形容词
疑问句：Do / Does + 主语 + 感官系动词 + 形容词？
例句
This bed feels soft.
The biscuits taste sweet.
You look tired.
The milk smells sour.
The idea sounds good.
3. 变化系动词（go, get, become）
含义：表示人或事物的状态发生某种变化。
结构（挖空填写）：主语 + go /get/become + 形容词
例句
The meat goes bad.
It was getting very dark.
Leaves become yellow in autumn.
He becomes excited before the match.
4. 保持系动词（remain）
含义：表示人或事物的状态保持一致、没有发生变化。
结构（挖空填写）：主语 + remain + 形容词
例句
Her room remains clean and tidy.
He remains calm in trouble.
三、系动词否定和疑问形式
除 be 动词外，其他系动词的否定和疑问形式需要借助助动词 do / does：
否定句：主语 + do /does not + 系动词 + 表语
疑问句：Do / Does + 主语 + 系动词 + 表语？
例句
The dishes do not smell very nice.
Does he look worried
Life does not remain the same.
四、配套练习
（一）基础填空
This bed __________ (feel) very soft.
The music __________ (sound) beautiful.
The meat __________ (go) bad.
He __________ (remain) calm in trouble.
The cake __________ (not taste) very good.
（二）句型转换
The flowers look beautiful.（改为否定句）The flowers __________ __________ beautiful.
The milk smells sour.（改为一般疑问句）__________ the milk __________ sour
Leaves become yellow in autumn.（对划线部分提问）__________ __________ leaves __________ in autumn
He feels happy.（改为同义句）He __________ happy.
（三）情景选择
当你想表达 “这汤尝起来很美味” 时，应说：A. The soup tastes delicious.B. The soup is tasted delicious.
当你想表达 “天气变得越来越冷” 时，应说：A. The weather gets colder and colder.B. The weather is got colder and colder.
五、参考答案
（一）基础填空
feels
sounds
goes
remains
does not taste
（二）句型转换
do not look
Does; smell
What colour; become; yellow
is / looks
（三）情景选择
A
A
系动词课堂小测
（时间：15 分钟 满分：30 分）
一、单项选择（每题 2 分，共 10 分）
This bed ______ very soft.A. feels B. is felt C. feel
The music ______ beautiful. Let’s listen to it again.A. sounds B. is sounded C. sound
The meat ______ bad. We can’t eat it.A. goes B. is gone C. go
—Does he look worried —Yes, he ______.A. does B. is C. looks
Her room ______ clean and tidy.A. remains B. is remained C. remain
二、用所给词的适当形式填空（每题 2 分，共 10 分）
The biscuits __________ (taste) very sweet.
The milk __________ (smell) sour. Don’t drink it.
It __________ (get) dark. Let’s go home.
He __________ (remain) calm when he heard the bad news.
The dishes __________ (not look) very nice.
三、句型转换（每题 2 分，共 10 分）
The flowers look beautiful.（改为否定句）The flowers __________ __________ beautiful.
The cake tastes good.（改为一般疑问句）__________ the cake __________ good
Leaves become yellow in autumn.（对划线部分提问）__________ __________ leaves __________ in autumn
He feels happy.（改为同义句）He __________ happy.
The idea sounds good.（改为否定句）The idea __________ __________ good.
参考答案
一、单项选择
A
A
A
A
A
二、用所给词的适当形式填空
taste / tastes
smells
is getting / gets
remained
don’t look
三、句型转换
don’t look
Does; taste
What colour; become
is / looks
doesn’t sound

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