2014年12月英語六級(jí)語法之特定句型

2014年12月英語六級(jí)語法之特定句型
    since和for的用法：
    since 用來說明動(dòng)作起始時(shí)間，for用來說明動(dòng)作延續(xù)時(shí)間長(zhǎng)度;
    eg：I have lived here for more than twenty years.
    I have lived here since I was born.
    for后面多接一段時(shí)間，而since后面則接一個(gè)時(shí)間點(diǎn)，若since后面也出現(xiàn)時(shí)間段，則在時(shí)間段后加ago;
    eg： I have lived here for twenty years ago.
    錯(cuò)句：I have worked here since twenty years.
    since句型：
    It is +一段時(shí)間+ since從句，since從句要用一般過去時(shí);
    eg：It is two years since I became a postgraduate student.
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