一般遥时代替完成时1) 有些动词用一般遥时代替完成时： 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.