asif用法小结

as if 用法

　　一、as if 从句的作用

　　1. 在look, seem 等系动词后引导表语从句。

　　如：

　　She looks as if she were ten years younger.

　　她看起来好像年轻了十岁。

　　It seems as if our team is going to win.

　　看来我们队要胜了。

　　2. 引导方式状语从句。

　　如：

　　She loves the boy as if she were his mother.

　　她爱这男孩，就好像她是他的母亲一样。

　　The child talked to us as if he was a grown up.

　　那孩子跟我们谈起话来，像个成年人似的。

　　二、as if 还可用于省略句中如果as if 引导的从句是“主语+系动词”结构，可省略主语和系动词，这样as if 后就只剩下名词、不定式、形容词(短语)、介词短语或分词。

　　如：

　　He acts as if (he was) a fool.

　　他做事像个傻子。

　　Tom raised his hands as if (he was going) to say something.

　　汤姆举起手好像要说什么。

　　She left the room hurriedly as if (she was)angry.

　　她匆忙离开房间好像生气的样子。

　　三、as if 从句的语气及时态

　　1. as if 从句用陈述语气的情况。 当说话者认为句子所述的是真实的或极有可能发生或存在的事实时。

　　如：

　　It sounds as if it is raining.

　　听起来像是在下雨。

　　He talks as if he is drunk.

　　从他谈话的样子来看他是醉了。

　　2.as if 从句用虚拟语气的情况。 当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下：

　　(1)如果从句表示与现在事实相反，谓语动词用一般过去时。

　　如：

　　You look as if you didn’ t care.

　　你看上去好像并不在乎。

　　He talks as if he knew where she was.

　　他说话的样子，好像他知道她在哪里似的。

　　(2)从句表示与过去事实相反，谓语动词用“had+过去分词”。

　　如：

　　He talks about Rome as if he had been there before.

　　他说起罗马来好像他以前去过罗马似的。

　　The girl listened as if she had been turned to stone.

　　那女孩倾听着，一动也不动，像已经变成了石头似的。

　　(3)从句表示与将来事实相反，谓语动词用“would/could/might+动词原形”。

　　如：

　　He opened his mouth as if he would say something.

　　他张开嘴好像要说什么。

　　It looks as if it might snow.

　　看来好像要下雪了。

语法学习：as if虚拟语气的用法

　　as if虚拟语气的用法

　　有时用虚拟语气，若表示与现在事实相反，谓语动词用一般过去时;若表示与过去事实相反，用过去完成时;表示将来的可能性不大，用would (might, could)+动词原形。

　　(1) 从句所表示的内容若为事实或可能为事实，也可用陈述语气：

　　例：It looks as if we'll be late.

　　我们似乎要迟到了。

　　This meat tastes as if it has already gone bad. 这

　　肉吃起来似乎已经坏了。

　　在现代英语中，有时即使从句内容不是事实，也可能用陈述语气：

　　例：

　　I feel as if [as though] I'm floating on air.

　　他感到好像漂浮在空中。

　　The stuffed dog barked as if it is [were, was] a real one.

　　玩具狗叫起来像真狗。

　　(2) 注意 It isn't as if…的翻译：

　　例：

　　It isn't as if he were poor.

　　他不像穷的样子(或他又不穷)。

　　It isn't as if you were going away for good.

　　又不是你离开不回来了。

【每日单词】语法As if and As though的用法

　　as is/though + subject + present/past verb

　　as is/though + subject + past verb with present meanning

　　1. As if and as though mean the same

　　we use them to say what a situation seems like.

　　a. It looks as if/though it's going to rain.

　　b. I felt as if/ though I was dying.

　　2. We can use a past tense with a present meaning after as if/though. This means that the idea is 'unreal'.

　　compare:

　　a. He looks as if he's rich.(Perhaps he is rich.)

　　b. She talks as if she was rich. (But she isn't.)