内容正文:
攻略04 情态动词(七大题型总梳理)
·模块一 can/could/be able to用法分述。
·模块二 may/might用法分述。
·模块三 must/have to用法分述。
·模块四 should/ought to用法分述。
·模块五 need用法分述。
·模块六 will/would用法分述。
·模块七 would rather/had better用法分述。
模块一
can/could/be able to用法分述
1. can/could的基本形式和用法:
could是can的过去式,或作为委婉语
a. 用于请求或允许,意为“能……”
· -- Could/Can I have the television on?
-- Yes, you . / No, you .
b. 在疑问句和否定句中表示推测,意为“可能……吗?”、“不可能”
· 他可能是坏人吗?他不可能是坏人。
he a bad guy? No, he a bad guy.
c. 用于陈述句,表示事情发生的“理论上的可能性”,意为“会”
· 事故总会发生。
d. 表示能力,意为“能够”
· He speak English when he was young.
could作为can的过去时/委婉语,请打勾
过去时
委婉语
表请求或允许
表推测
表可能性
表能力
2. can/could与be able to的差别:
a. 表示能力时, can表示现在、could表示过去;be able to可以用于任何时态,也可以前加情态动词或助动词,如:will be able to, have been able to, should be able to
b. 用于过去时中,could表示“有能力做”而“并不一定做成”;若是“实际得以做成某事”,只能用was/were able to=manage to do sth.
· 司机得以逃生,其他的乘客没有逃出来。
The driver escape, but the passengers failed to do so.
Ms. Wang could sing well when she was young.
I was able to pass the examination. 我通过了考试.(不仅有能力,而且实际上做到了.相当于I succeeded in passing the examination.)
I could pass the examination. 我当时有能力通过考试.(有能力,但实际上不一定做得到)
can/could与be able to差别总结
can/could
be able to
表请求或允许
√
表推测
√
表可能性
√
表能力
√
时态
用于过去时中含义
3. can/could的惯用语:
a. cannot help doing sth.情不自禁做某事
· 我情不自禁地笑了。
I cannot help .
b. cannot help/choose but do sth.不得不,只能做某事
· 我不得不告诉她真相。
I cannot help/choose but .
c. cannot … too + adj./adv. 无论怎样都不为过,越……越好
· 你越小心越好。
You cannot too .
d. cannot … without 没有……就不能
· One cannot succeed without perseverance.
没有就不能。
e. could not + 比较级 = 最高级
· -- Go for a picnic this weekend, OK?
-- I couldn’t agree more.
★真题试炼★
1.You may not be able to control all the things that happen to you, but you _______ decide not to be reduced by them.
A.should B.must C.need D.can
2.The volunteer spoke as clearly as she _________ to make the visitors understand her.
A.possible B.can C.could D.are able
3.—Look, Sarah, there’s a red notebook on the desk. Whose is it?
—It _____