2017年12月六級(jí)考試馬上到來(lái)了，為了讓同學(xué)們更好準(zhǔn)備六級(jí)考試，特別整理了《2017年12月英語(yǔ)六級(jí)語(yǔ)法：since的四種用法》，希望可以為大家?guī)?lái)幫助, 預(yù)祝大家高分通過(guò)考試。
since的四種用法
1) since +過(guò)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.