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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这9件事真的可耻吗?
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各种云朵的英文说法
Syrian FM urges foreign journalists to respect rules
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跟水有关的表达
Factories shut down over toxic glue
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一天三餐的英语单词
Transplant system to go national
英语四季的单词
Civil servants must learn English
拒绝还是接纳——来自流浪汉的启发
Cracks near super tower prove unsettling
英语中各种颜色的表达
US state approves same-sex marriage statute
More US films set for China
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Houston gets posthumous boost
Investment to be stimulated
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Program to champion rights of nonsmokers
Bills call for legalization of gay marriage in Australia
Flight delays decrease in 2011
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