10. It is …since…
该句型主要用作处理瞬间动词的完成时,要和表示一段时间的时间状语连用。主句中是时间作表语,其时态是现在时和完成时,引导的从句通常是一般过去时态,而且是瞬间动词。如果主句是一般过去时,从句则用过去完成时。
It is (has been) 5 years since his father died.
It is almost five years ___we saw each other last time. (2005 北京)
A. before B. since C. after D. when(B)
11. It is …when…
该句型中的when引导的是一个时间状语从句,主句中的it指时间,表语由具体的时间充当。常译为“当……的时候,是……
It was 5 o’clock when he came here.
12. It be…before…
该句型主句中的it指时间,主句中的时态常是一般将来时或过去时两种时态,主句中的表语多是long ,not long ,3 days, 2 weeks等表示时间段的词和短语。常译为“…之后才,“没过……就……
It was 3 days before he went to Beijing.
It will not be long before he finishes his job.
13. It happens (seems, looks, appears) that…
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