2017年6月cet6語法動詞時態(tài)之since的四種用法

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在大學(xué)英語六級考試中,單獨考察語法的題型不多,但是對于語法的考察卻貫穿整張試卷。下面小編為2017年6月份參加大學(xué)英語六級考試的同學(xué)們整理了一些英語六級語法考察側(cè)重點,希望對大家有所幫助!
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    since的四種用法
    1) since +過去一個時間點 (如具體的年、月、日期、鐘點、1980, last month, half past six)。
    I have been here since 1989.
    2) since +一段時間+ ago
    I have been here since five months ago.
    3) since +從句
    Great changes have taken place since you left.
    Considerable time has elapsed since we have been here.
    4) It is +一段時間+ since從句
    It is two years since I became a postgraduate student.