内容正文:
情态动词
主讲老师:Demi老师
Grammar课堂之
1.什么是情态动词?
实义动词:比如want、like、go等
01
动词的分类,分为以下四大类:
04
情态动词:can ,should,must,may等
03
助动词:do、does、did;will、shall;have、has等
02
系动词:feel、taste、sound、look、smell
(5个感官动词)等;
2.情态动词知多少?
can
could
may
must
need
should
情态动词的几大特点:
can
could
may
must
need
should
情态动词+动词原形
情态动词否定后面直接+not
情态动词变疑问句,直接提前
情态动词无三单、无将来
注意:have to例外,用于第三人称单数时变成has to
练一练
-- people talk with friends by QQ twenty years ago?
--No, but today most of us do that.
A. Can; could
B. Could: can
C. Could; could
D. Could; can't
B
3.情态动词基本用法
can
could
VS
能力
be able to
VS
can的过去式
情态动词
① I can play basketball.
=I am able to play basketball.
② I can make my dream come true in the future.
=I will be able to make my dream come true in the future.
③ I could play basketball when I was young.
=I was able to play basketball when I was young.
=can/could
一般现在时
一般过去式
一般将来时
1.表能力
练一练
1.They do well in the exam.
A.can be able to B.be able to C.can able to D.are able to
[题目解析]D选项 ;can与be able to不能连用A与C错误;
D
can
could
VS
may
VS
情态动词
2.表请求
might
VS
情态动词 肯定回答 否定回答
can
could
may
might
Yes,you can.
Of course.
No,you can't
No,you mustn't(禁止)
——Can/Could/May I leave now?
——Yes,you can/Of course.
——No,you can't/No,you mustn't
委婉程度:can——could——may——might
练一练
2-1.—Robert,could you wash the car for me?
—Yes,I .I'm coming,Dad.
A.could B.couldn't C.can D.can't
[题目解析]C选项;考查情态动词的用法。根据答语yes,排除B项和D项;问句Could you...?是表请求的句子,回答时不能用could或couldn’t,应用can或can’t来回答,故选C。
2-2.—Could I smoke here?
—Sorry,I am afraid you .Look at the sign “No smoking”!
A.couldn't B.needn't C.can't D.won't
C
C
have to
must
VS
“不得不/必须”
客观条件限制(被迫)
don't have to “不必”=needn't
“必须”
主观条件限制(主动)
mustn't “禁止”
You have to finish it in 2 minutes.
I must study hard.
You don't have to worry.
You mustn't park here.
情态动词
3.表必要
练一练
3.I'm feeling much better now, so you call he doctor.
A.can't B.mustn't C.don't have to D.haven't to