概要：11)-When can I come for the photos﹖ I need them tomorrow afternoon．-They ＿＿＿＿＿ be ready by 12?00． (NMET'98)A． can B． should C． might D． need该题考查情态动词should的基本含义，分析句意可知本题应选B。又如：12) The fire spread through the hotel very quickly but everyone ＿＿＿＿ get out．(NMET'97)A． had to B． would C． could D． was able to该题考查了could和be able to的区别，二者都可表示过去时间的能力，但如果表示过去成功地做了某事只能使用was ／ were able to do，故本题选D。13) -Shall I tell John about it ﹖-No, you ＿＿＿＿＿． I've told him already
高考英语语法讲义,标签：高中英语语法大全,http://www.85jc.com11)-When can I come for the photos﹖ I need them tomorrow afternoon．
-They ＿＿＿＿＿ be ready by 12?00． (NMET'98)
A． can B． should C． might D． need
该题考查情态动词should的基本含义，分析句意可知本题应选B。又如：
12) The fire spread through the hotel very quickly but everyone ＿＿＿＿ get out．(NMET'97)
A． had to B． would C． could D． was able to
该题考查了could和be able to的区别，二者都可表示过去时间的能力，但如果表示过去成功地做了某事只能使用was ／ were able to do，故本题选D。
13) -Shall I tell John about it ﹖
-No, you ＿＿＿＿＿． I've told him already． (NMET'94)
A． needn't B． wouldn't C． mustn't D． shouldn't
情态动词shall在试题中表示征询对方意见或请求指示。答句暗示 "没有必要了"，故本题选A
虚拟语气
" 最自然的虚拟状态：由should/would+原型时态（不含时间只含状态）
本质上是过去将来时：即，时间固定在过去将来，状态不同：一般、进行、完成、完成进行。
这时"虚拟语气"的产生往往是因为我们要表达"本来应该……"（而现在却还没有……）
（本来可以……，本来能……）
I should go! (… but I'm still here!) (一般)
I should be working now! (进行)
I should have practiced more (than I did)! (完成)
我应该多多练习！（言下之意，现在我练习得不多。）
I shouldn't dream away my time too much! (完成的否定)
(actually I did dream away my time too much!)
It shouldn't have been leaking for such a long time! (完成进行)
I may/might/could have finished! (完成)
一些常见的句型中，就会出现这种虚拟语气，而处于从句之中，should 常常被省略掉
o suggest, advise, propose, recommend, plan;
o demand, order, direct, arrange, command, decide;
o require, request;
o think, expect, believe, insist, suspect.
由于他们的含义中包含"建议，假设，应该"这类的含义，所以，由他们引起的从句中，就会包含有should+原型时态构成的虚拟语气。
这些动词（以及他们的名次形式，分词形式）引起的从句还有其他的变形：
主语从句，表语从句，同位语从句
It's suggested that…
My suggestion is that…
The only suggestion that...
The only suggestion I can give you now is that…
一些形容词引起的表语从句中，也会有同样的情况
important; necessary; essential
It's natural ; strange; incredible that
a pity; a shame; no wonder
? 由lest, for fear that, in case 引起的从句中多使用should
" 表达与事实相反
1. 与现在相反：使用[过去时]：
I wish I were not here! (一般现在'一般过去)
Suppose we were not here.
He loved me as if I were his own son. (一般现在'一般过去)
Hope I weren't always losing things! (现在进行'过去进行)
If only/If I hadn't been there! (现在完成'过去完成)
What if I hadn't been waiting right here! (现在完成进行'过去完成进行)
常考句型：It's (high) time (that)…; would rather (that)…
这两个从句，只能表达对现在的看法，所以，从句中只有一般过去时。
2. 与过去相反：过去完成时；
How nice it is if I had past the test!
How nice it is if I had slept a little more this morning!
3. 与将来相反？将来的事情没有发生，所以只能推测且实现可能很小
I wish he could not smoke any more.
不过，由于可以用be to表示将来；所以，虚拟语气中经常出现were to；也是CET-4的常考语法点。
" 虚拟条件句
o if 部分，做一个与事实相反的假设（所以只有一般过去和过去完成）；
o 主句部分，这是表示基于这个假设的推测，一般使用情态动词would，少数情况下使用could/might/should。
o 注意：两个部分之间，是有逻辑关系，而在两部分的谓语动词时态上，没有必然的联系。
" 注意，虚拟条件句中的if可以省略，造成were/had提前，产生倒装。
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