内容正文:
四清导航
6
英语九年级上册人教版
单元语法精讲精练
情态动词must,can/could,may/might表示推测时,要根据肯定、香否定或疑问的
不同形式选用不同的情态动词。
“情态动词十do sth.”表示对现在事情的推测;“情态动词十be doing sth.”表示对
正在发生的事情的推测;“情态动词十have done sth.”表示对过去或己完成事情的推测。
They must be in the classroom now.他们现在一定在教室里。
It's eight o'clock.My grandfather must be doing sports in the park.现在是八点,我
的爷爷一定正在公园锻炼。
Peter may/might have been hurt in the car accident.彼得可能在车祸中受了伤。
·肯定推测
(1)must用于肯定句,意为“准是;一定”,后面接动词原形,表示较有把握的推测。
一've had no sleep for48 hours..我已经48小时没睡觉了。
-You must be exhausted.你一定筋疲力尽了。
【注意】mustn't表示“禁止;绝不允许”。
(2)may,could,might意为“可能;也许”,表示可能性较小的肯定推测。
You may be right..你可能是对的。
He could/might be running for exercise..他可能正在跑步锻炼。
(3)can用在肯定句中,表示理论上的可能性。
Smoking can cause cancer.吸烟有可能引发癌症。
否定推测
(1)表否定推测时,can't/couldn't语气最强,指“不可能”,带有惊异、怀疑的感情
色彩。
The story sounds reasonable,but it can't be true.这个故事听起来合情合理,但不
可能是真的。
(2)may not/might not/could not表示不太有把握的否定推测,意为“可能不(会)是”。
He could not/might not be at home.I'm not sure.他可能不在家,我不确定。
·凝问句中的推测
疑问句中的推测,常用can或could,意为“可能”。
There is someone outside.Who can it be?外面有人,会是谁呢?
●句型:(1)“Whose十一般疑问句?”
(2)“Vhose+名词十一般疑问句?”
答语:(1)使用名词所有格或物主代词来回答。
(2)使用“belong to sb.”结构来回答。
-Whose is this umbrella?Whose umbrella is this?这把雨伞是谁的?
一lt's Mary's./It belongs to Mary..是玛丽的。
一、用方框中所给的情态动词填空。
1.-Jenny got lots of gifts at the birthday party yesterday.
-Yeah.She muust be very happy.
2.Mr.Gao can't be at home right now.He hasn't come back yet.
3.-Where are my keys,Mom?
-I have no idea.They could/might be in your schoolbag.
4.-There is a black jacket hanging over there.Is it Peter's?
-No,it can't be his.He never wears black clothes.
5.-Do you know who locked the office yesterday afternoon?
-Well,it
must
have been Susan.She is the last one to leave every day.
二、根据汉语意思完成句子,每空一词。
6.你从今天早上开始就没有吃过东西。你一定饿了。
You haven't eaten anything since this morning.You must
be hungry.
7.他明天可能来,但是我不太确定。
He might/may come tomorrow,but I am not sure.
8.我的书不见了。会是谁拿走了它呢?
My book has disappeared.Who could have taken it?
9.这不可能是我们的英语老师,他去美国了。
It can't be ou