It____(snow) twice in his hometown sice a week ago .横杆上填写:sn
It____(snow) twice in his hometown sice a week ago .横杆上填写:snowed
More buildings have been _____ (build)since five years ago .而这里却填写built 用现在完成时?since+一段时+ago 到底是什么时态的标志词啊?
More buildings have been _____ (build)since five years ago .而这里却填写built 用现在完成时?since+一段时+ago 到底是什么时态的标志词啊?
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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.
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.
1年前
4
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