小升初必備語(yǔ)法：since的四種用法介紹

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.
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