It is ( has been ) 5 years since his father died.
9. 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 oclock when he came here.
10. It be ... before ...该句型主句中的 it 指时间, 主句中的时态常是将来一般时或过去时两种时态.主句中的表语多是long, not long , 3 days , 2 weeks 等表示时间段的词或短语。常译为之后。
It was 3 days before he went to Beijing.
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