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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