一般現在時代替完成時

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11.24 一般現在時代替完成時
	1) 有些動詞用一般現在時代替完成時： 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.