由 have 加動詞的過去分詞構(gòu)成,主語是第三人稱單數(shù)時(shí),要將have 改為has.
  例句:
  I have seen the film already. 我已經(jīng)看過那部電影了。(現(xiàn)在我知道電影的內(nèi)容了)
  Have you seen my bag?你看到我的手提包了嗎?(你知道它在哪里?)
  She has been a dancer for ten years. 她已當(dāng)了十年的舞蹈演員了。
  We‘ve planted thousands of trees in the past few years. 過去幾年我們種了成千上萬棵樹。