什么是虚拟语气的特殊句型?

1.Would that…表示但愿，要是…就好了。
Would that he passed the exam.
他要是及格就好了。
2.If only (that)…表示但愿，要是…就好了。
If only (that) my father were here!
要是我父亲在这就好了。
3.Even if…表示即使…也。
Even if I failed, I wouldn't give up.
即使我失败了，我也不放弃。
4.It is (high) time后接一般过去时，表示该是…的时候了。
It is (high) time (that) I left.
我该走了。
5.在动词suggest(提议)，ask(请求)，decide(决定)，order(命令)等后面的从句中的动词形式是should＋原形动词，should可以省略。
I suggested that he (should) go home.
我建议他回家。
6.It is＋good(应该的)，wrong(不当的)，important(重要的)，necessary(必须的)＋that＋主语＋should＋原形动词，should可以省略。
It is important that we (should) learn English well.
学好英语是重要的。
7.虚拟语气中的状语从句可以省略if，此从句中的助动词had，were，should等要移至主语之前。
Were I a boy, I would learn boxing.
如果我是男孩，我就学拳击。
Should it be summer, I would go swimming.
如果是夏天，我就去游泳。
Had I been there yesterday, I would have seen you.
如果我昨天在那，我就会见到你了。