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11.24 一般现在时代替完成时

    1) 有些动词用一般现在时代替完成时:
    hear, tell, learn, write , understand, forget, know, find , say, remember.
     I hear (= have heard) he will go to London.
     I forget (=have forgotten) how old he is.
    2) 句型 " It is … since…"代替"It has been … since …"
    3) It is (= has been) five years since we last met.

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