Sequence of tense of adverb clauses of time

Trong chuyên mục 'Writing (Viết)' đăng bởi Newsun, 20/4/2010. — 3.741 Lượt xem

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    Sequence of tense of adverb clauses of time

    SEQUENCE OF TENSE OF ADVERD CLAUSES OF TIME
    (Sự phối hợp thì của mệnh đề trạng ngữ chỉ thời gian)

    *Nhận biết: được dẫn đầu bằng những liên từ: AS SOON AS, AS, WHILE, WHEN, TILL, UNTIL, AFTER, BEFORE, SINCE...
    *NOTE: Không dùng thì tương lai trong mệnh đề trạng ngữ chỉ thời gian.

    Main clause:
    SIMPLE PRESENT
    =>Adv of time:
    - SIMPLE PRESENT
    - PRESENT PROGRESSIVE
    -PRESENT PERFECT
    Ex:
    1.The secrectary always goes home as soon as her boss leaves the ofice.
    2.I often read a newspaper while I'm waiting for a bus.
    3.He never goes home before he has finished his work.

    Main clause:
    SIMPLE PAST
    =>Adv of time:
    - SIMPLE PAST
    - PAST PROGRESSIVE
    - PAST PERFECT
    Ex:
    1.All students stopped laughing when the teacher came in.
    2.I saw him when he was talking to a girl.
    3.Yesterday, I went to the post office after I had written a letter.

    Main clause:
    SIMPLE FUTURE
    =>Adv of time
    - SIMPLE PRESENT
    - PRESENT PROGRESSIVE
    - PRESENT PERFECT
    Ex:
    1.I'll give him some helps when i see him tomorrow.
    2.I'll think it over while I am having lunch.
    3.I'll wait for you until you have finished your meal.

    Main clause:
    PRESENT PERFECT
    =>Adv of time:
    - SIMPLE PAST
    - PRESENT PERFECT
    - PRESENT PERFECT PROGRESSIVE
    Ex:
    1.He has played football since he was 10 years old.
    2.I have learned a lot since I have lived here.
    3.He has busied a lot since he has been attending this course.
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