英语语法：过去完成时基本结构

由 had 加动词的过去分词构成。

例句：

She said she had never been to Paris. 她说她从未去过巴黎。

When the police arrived,the thieves had run away. 警察到达时，小偷们早就跑了。

By the time he was twelve,Edison had begun to make a living by himself. 到了十二岁那年，爱迪生开始自己谋生。

英语语法：现在完成时基本结构

由 have 加动词的过去分词构成，主语是第三人称单数时，要将have 改为has.

例句：

I have seen the film already. 我已经看过那部电影了。(现在我知道电影的内容了)

Have you seen my bag?你看到我的手提包了吗?(你知道它在哪里?)

She has been a dancer for ten years. 她已当了十年的舞蹈演员了。

We‘ve planted thousands of trees in the past few years. 过去几年我们种了成千上万棵树

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