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③让步状语从句
让步状语从句指事实时，从句谓语动词用陈述语气。若从句内容表示现在和将来的假设情况，从句谓语动词用虚拟语气。
Though
he (should) fail, there would still be hope.即使他失败了，仍有一线希望。
I should
say the same thing even if he were here.即使他在这里，我还是要这么说。
Whether
he (should) succeed or fail, we shall have to do our part.不管他成功还是失败，我们还是要做好自己的事。
However
hard it might rain rains, we shall go there together.不管雨下得多么大，今晚我们还是要去那里。
No
matter what his social position (might) be, a man is equal in the eye of the
law.一个人不论其社会地位如何，在法律面前都是平等的。
C．定语从句中的虚拟语气
在It
is (high) time (that) ...结构中，定语从句的谓语动词用过去式，表示“到某人该做某事的时间了”。
It is
time that the children went to bed.到孩子们睡觉的时间了。
It is
high time that we began the meeting.正是我们开会的时间了。
四、其他句型中的虚拟语气
A．If
only......
If only位于句首引起的感叹句用虚拟语气，动词用一般过去时表示目前的愿望，用过去完成时表示过去的愿望，用would或could表示将来。
If only
he knew the answer.他要是知道答案就好了。（用过去时表示现在）
If only
I could speak several foreign languages！我要是能讲几种外语就好了！（用wouldcould表示将来）
If only
you had told me the truth before. 要是你以前告诉我真相就好了。（用过去完成时表示过去）
注意：if
only和wish的用法相同，表示的意愿也基本相同。
If only
it would rain.但愿天能下点儿雨！= How I wish it would rain.
If only
I had known her earlier!要是我早点儿认识她就好了！= I
wish I had known her earlier.
B．would
rather
would
rather, would prefer, would sooner等后接从句，表示“宁愿”，动词用过去时表示当时和将来的情况，用过去完成时表示过去的情况。
I would
rather you left today.我宁可你今天走。
I would
prefer he didn't stay here too long.我倒希望他不要在这儿呆得太久。
I would
rather I hadn't seen that film yesterday.我宁愿昨天没有看那场电影。
提示：
would
rather主要有两种用法。
1．后接不带to的不定式
I'd
rather play tennis than swim.我宁愿打网球，也不愿游泳。
I'd
rather not go to the movies.我宁愿不去看电影。
Which
would you rather have, tea or coffee你喜欢喝茶，还是咖啡
2．后接不用连词的that从句
I'd
rather you went home now.我希望你现在就回家。
I would
rather my daughter attended a public school.我希望我的女儿能上公立学校。
C．表示愿望的感叹句
在表示祝愿的感叹句中，用动词原形，表示愿望。
Long
live the People's Republic of China!中华人民共和国万岁！
May you
be happy!祝您快乐！
God
bless you!上帝保佑你！
Success
attend you!祝你成功！
The Lord
save us!愿主救我们！
D．情态动词用于虚拟语气
部分情态动词的过去形式（could,
might, should, would），可以用于非真实条件句以及其他结构中表示虚拟语气。
1．表示想像或猜测
If I
could speak French, I would teach you.如果我会说法语，我就能教你。（我不会，所以不能教你）
If you
phoned him right now, you might get the matter settled.如果你现在给他打电话，你就可以把问题解决了。
There
could be something wrong with the tape recorder.这台录音机可能出毛病了。
He might
have said so.他可能这样说过。
Could he
have done such a foolish thing他会做这样的傻事吗？
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