内容正文:
现在完成时
1,结构:主语+have/has+动词过去分词
例句:I have eaten an apple.
否定:
疑问句:
答句:肯定/否定
2,使用情况:
第一种情况:动作在过去发生,对现在产生影响。
I have lost my keys,so I can’t go home now.
过去丢了钥匙,但对现在造成了影响回不了家。
又如:He has caught a bad cold.He can’t go to school.
第二种情况,动作从过去开始发生,并一直持续到现在,并且很有可能继续持续下去。
常和for+时间段/since+过去时间点(词组或从句)连用等时间状语。
常用在完成时中的时间状语:recently, already,yet,so far,until now, by now, ever。
辨析以下几组词汇:
just now/just, in the past/in the past few years,already/yet
Just 常和完成时连用,just now表刚才,应用一般过去时。
例句:I drank a glass of beer just now.
I have just drunk a glass of beer.(just一般位于have,has和过去分词之间)
In the past 在过去的某个时间点,和过去时连用,in the past few years是过去的几年里,是时间段。
例句: I was a teacher in the past
I have been a teacher in the past few years.
already表已经,位置比较灵活:
I have eaten the cake already.
I have already eaten the cake.
yet既可以翻译为已经,也可以翻译为还没。
在填空时需要注意辨别两个中文意义:
Have you found your keys (已经)?
For+时间段:
A I have taught English for 5 years.(时间段)
例句A若改为since:自从 引导:I have taught English since 5 years ag