顺便加一点例子。

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顺便加一点例子。

顺便加一点例子。
顺便加一点例子。

顺便加一点例子。
虚拟语气:用来表示说话人所说的话不是事实,而是一种假设、愿望、怀疑或猜测.
1)表示于现在事实相反的情况:
从句谓语动词为过去式(be一般用were),主句谓语动词形式为should/would/could/might+动词原型.
eg:If I were you,I would help her.
如果我是你,我会帮他.
2)表示于过去事实相反的情况:
从句谓语动词为had +动词过去分词,主语谓语动词形式为should/would/could/might+动词过去分词.
eg:If I had visited the place before,Iwould have known the way.
如果我去过那个地方,我就认识路了.
3)表示与将来事实相反的情况:
从句谓语动词为动词过去式、should+动词原形、过去将来是或were to +动词原形、主语谓语动词原形形式都为should/would/could/might+动词圆形.
eg:If you should be late tomorrow,we would not wait for you.
万一你明天迟到了,我们就不等你了.

百度去搜,太多资料,写不下。