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    時(shí)態(tài)的比較
    1．一般現(xiàn)在時(shí)與現(xiàn)在完成時(shí)
    (1)I come from Shanghai．(上海人)
    I have come from Shanghai．(從上海來)
    (2)You read very well．(強(qiáng)調(diào)能力)
    You've read very well．(強(qiáng)調(diào)一次剛完成的動(dòng)作)
    (3) I forget．(一時(shí)想不起來了)
    I have forgotten．(仍沒想起來，可能已回憶起來了)
    (4) The book is written in simple English．(表狀態(tài))
    The book has been written in simple English．(表動(dòng)態(tài)，已用英語寫成)
    (5) Every time I see him，he's been reading．(兩個(gè)動(dòng)作不可能同時(shí)進(jìn)行)．
    Every time l have seen him，he's been reading．(強(qiáng)調(diào)兩個(gè)動(dòng)作同時(shí)進(jìn)行)
    (6) He is gone．(強(qiáng)調(diào)狀態(tài))He has gone．(強(qiáng)調(diào)動(dòng)作和時(shí)間)
    (7) He won't come till the play begins．(演出開始時(shí))
    He won't come till the play has begun．(戲已開始)
    (8)AfterI leave school，I'11 go to college．(兩個(gè)動(dòng)作緊密相接)
    After l have left school，I'll go to college．(強(qiáng)調(diào)畢業(yè)后，兩個(gè)動(dòng)作可能有間隔)
    (9) It is a long time since I saw you last．
    It's been a long time since Isaw you last 這兩句話一樣，后一句是美國英語)
    (10) Where are you?(在哪兒) Where have you been?(去了哪兒)