四六級(jí)頻道為備考英語四六級(jí)的同學(xué)整理了《2019年12月英語四級(jí)語法用法辨析：since的四種用法》一文，希望可以為大家?guī)韼椭?，預(yù)祝大家高分通過本次考試!
2019年12月大學(xué)英語四級(jí)語法用法辨析匯總
英語四級(jí)語法用法辨析：since的四種用法
1) since +過去一個(gè)時(shí)間點(diǎn) (如具體的年、月、日期、鐘點(diǎn)、1980, last month, half past six)。
I have been here since 1989.
2) since +一段時(shí)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(shí)間+ since從句
It is two years since I became a postgraduate student.