英语疑难解析：与现在事实相反的虚拟语气

#英语易错知识点#

与现在事实相反的虚拟语气：

此时条件从句的谓语动词用过去式，主句的谓语则要用 would (should，could，might)+动词原形：

If there were no subjective mood，English would be much easier.

要是没有虚拟语气，英语就会容易得多了。

If I knew his telephone number，I would ring him up.

我要是知道他的电话号码，我就给他打电话了。

在虚拟条件句，动词be的过去式通常用were(不管是单数还是复数)，但在现代英语，单数情况也可以用was：

We could ask him if he were [was] here.

他要是在这里，我们就可以问问他了。

但是在某些表达(If I were you，as it were等)中，be只用were这一形式：

If I were you，I should go and see the doctor at once.

假若我是你，我会马上去看医生。

The sky is covered，as it were，with a black curtain.

天空好像是被黑幕遮住了似的。

有时在虚拟条件句也可能用 could，might等，那多半是因为语义的需要：

If he could help you，he would help you.

要是他能够帮助你的话，他会帮助你的。

看下面的题目：

If he was here，he __________ us how to do it.

A.told

B.would tell

C.had told

D.have told

此题应选 B。

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