asif,asthough引导的从句

as if,as though 引导的方式状语从句是否用虚拟语气取决于从句中所描绘的情况。如果情况与事实相符，就不用虚拟语气；反之，就用重拟语气。

It looks as if it is going to rain.

看起来好像天要下雨了。

She looks quite unhappy today,as if she has lost something.

她今天看起来很不高兴，好像丢东西了。

She always talks as if she knew everything of the world.(虚拟语气)

她谈起话来好像什么都知道似的。

She acted as if nothing had happened.她表现得好像什么都没发生。(虚拟语气)

1.as if,as though 主语＋could/might/would 动词原形（和将来事实相反）

It looks as if the old woman could live other hundred years.

那位老太太看上去好像还能活一百年。

He is speaking to the audience in the meeting-room as if he would never come back.

他在会议室讲话好像是再也不回来了。

2.as if,as though 主语＋动词过去式（和现在或当时情况相反）

The old man is lying on the ground as if he were dead.

老人躺在地上好像死了。

They have just met but they are talking as if they were old friends.

他们刚刚见面，但谈起话来就好像是老朋友似的。

3.as if,as though 主语＋were doing(和现在进行的情况相反）

They ran as fast as they could as if a ghost were chasing

他们拼命地跑就好像是有鬼追他们似的。

She murmured to herself as if she were talking to her god.

她在低声自语好像和她的上帝交流。

4.as if,as though 主语＋had 过去分词（和过去事实相反）

He ate as if he hadn't had a meal for years.

他的吃相就好像他很多年没吃过饭似的。

She talked as if she had been on the spot.

她谈话就好像是到过现场似的。