在虚拟语气中什么情况用would，什么情况用should

Question

请各位大虾多多指教！

Answer 1

一般情况下，本该做而未做或本不该做而已做时用should，实际上，would的使用范围比should大。

Answer 2

虚拟语气用在状语从句中。

虚拟语气最多地用在表示条件的状语从句和表示结果的主句中。在表示与事实相反的虚拟语气时，动词有三种时态形式，即现在，过去和将来。

与现在事实相反的：

条件从句 结果从句
If I (we,you,he,they)+ 动词过去式.. if I (he,she) were... I (we) should + 动词原形。 He (you,they) would + 动词原形。

与过去事实相反的：

条件从句 结果从句
If I(we,you,he,they)+ had + 过去分词 I(we)should + have+ 过去分词。He (you,they) would + have + 过去分词。

If I were you, I should buy it.

如果我是你，我就买了它。

If I had time, I would study French.

如果我有时间，我会学习法语的。

If she knew English,she would not ask me for help.

如果她懂英语的话，她不会找我帮忙的。

If you had got up earlier, you could have caught the train.

如果你早一点起床，就会赶上火车的。

If it were fine tomorrow,I would go shopping.

如果明天天气好，我就去买东西。

参考资料：http://www.cnread.net/cnread1/yyxx/yyyf/013.htm

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Answer 3

would是在请求别人做某事用的.