如题所述
since的用法有两点:一表示“自从……以来”,二是表示“既然”之意。
since的四种用法
1、since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six).、
I have been here since 1989.
2、since +一段时间+ ago
I have been here since five months ago.
3、 since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4、 It is +一段时间+ since从句
It is two years since I became a postgraduate student.
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第1个回答 2020-02-12
since的用法有哪些
第2个回答 2019-09-26
since是什么意思?用法是什么?
第3个回答 2019-07-03
主句用现在完成时,引导的部分用一般过去时