8.情态动词表推测ppt课件
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Exercise:
1. Whose earrings are these? They ____________ wears earrings sometimes.
may/ could/ bmeigMhatry’s. She
2. Carls _________________ come to the party tonight, but I’m not sure.
We could have walked to the station, it was so near.
;.
11
对过去推测的几组用法 3. may/ might have done
1)表对已经发生的事情不太肯定的推测,意为“可能已经,或许已经”
If we had taken the other road, we might have arrived earlier.
;.
9
对过去推测的几组用法
1. must have done
表对已经发生的事情的推测,意为“一定,想必”,在句子中表示的是一种肯定的 推测。这种结构一般只用于肯定句。
He didn’t hear the phone. He
masulesteph.ave been
They can’t have gonoeut, because the light is still on. 否定形式:can’t (couldn’t) have done
5. You’d better take an umbrella. It ____________
rcaainn’tthis afternoon.
must
may/might/c来自百度文库uld
;.
14
6. It’s the library! So you _______ know shomutuisntg is not allowed here. 7. --Have you decided where to spend your summer holiday?
;.
7
情态动词表推测的三种时态
对将来推测,“情态动词+动词原形” must be
She _________ very happy when she opens the door.
;.
8
情态动词表推测的三种时态
对过去或已经完成的推测,“情态动词+have+过去分词”
may have rained The ground is wet. It _____________ yesterday night.
3. The telephone is ringing, but nobody answer it, he _______ be at hmomaye/. might/ could
4. --Is this Lan Qiang’s boxing glove?
--Yes, it _________ be his. This is his name on the back.
The light is on, so my sister ___________ be at home.
may / might
;.
2
常用于表推测的情态动词
must (一定) will (很有可能) would (很有可能)
ought to
(应该,很有可能)
should (应该,很有可能)
can (可能) could (可能)
Could she have finished her homework?
【口诀】
can不肯, may/ could/ might不问,must不否问
注: can表示推测时,不用于肯定句;
may/might/could表示推测时,不用于 疑问句;
must表示推测时,不用于否定句或疑问 句。
;.
6
情态动词表推测的三种时态
情态动词表推测
He mubset Curnane! He migbhet thinking. He cabne’t a common boy.
;.
1
表推测的三种句式 1. 在肯定句中一般用must, may/ might,语气逐渐减弱。
The light is on, so somebody _____ be at home. must
2)虚拟用法:表可以做,但却没有做。 He might have given you more help, but he was very busy.
;.
12
三种句式
肯定 否定 疑问
常用于表推测的情态动词
推 测
情态动词表推测的三种时态
肯定 否定
现在/一般 将来 过去/完成
几组对过去的推测
;.
must have done can/ could have done may/ might have done 13
may (可能)
might (可能)
;.
最强 肯定推测
最弱
3
表推测的三种句式 2.在否定句中用can’t/ couldn’t(不可能),may not/ might not(可能不)。
It’s sunny. It ______ rain. can’t He ____m_a_y_n_o_t_____/mknigohwthnoowt to answer this question.
“不可能,肯定不会”
;.
10
对过去推测的几组用法 2. can/ could have done
表对过去的时间里可能发生的事情的推测,一般只用于否定句和疑问句。
He can’t have finished the work so soon.
用于肯定句中,常用来表示本来可以完成而实际未完成的动作。 “本来能做…..(而实际上没做)”
对现在或一般情况的推测 “情态动词+be” “情态动词+be doing” “情态动词+动词原形”
must be listing He ____________ to music.
can’t be He _________ at home now. The light isn’t on.
He _____m_a_y_w_orikn his office.
;.
4
常用于表推测的情态动词
must not
(禁止,不许)
(不用于推测)
can’t (肯定不, 不可能)
couldn’t
(肯定不,不可能)
may not
(可能不)
might not
(可能)
;.
最强 否定推测
最弱
5
表推测的三种句式
3. 在疑问句中,一般只使用can/ could。
Can your sister be at home now?