This is the first time I have come here.
It was the third time (that) he had made the same mistake.
② It is / has been + 一段时间 + since 从句。since 从句中用过去完成时。如:
It was ten years since we had had such a wonderful time.
③ be about to do…when…意为“即将……(这时)突然……”。如:
I was about to go out when the telephone rang.
④ be (was /were) + doing… when… 意为“正在干……(这时)突然……”。如
They were reading when Tom shouted in pain.
⑤ Hardly had…done…when… ; No sooner had…done…than…
when 和than 从句里用一般过去时,表示“刚刚……就……”。如:
Hardly (No sooner) had I got home when (than) the rain poured down.
我刚到家大雨就倾盆而下。中学
⑥ It + be + 一段时间 + before 从句
这个句式分两种情况:如果主句用将来时,则从句用一般现在时表将来时,意为多长时间以后即将发生某事;如果主句用过去时,从句也用过去时,意为多长时间后发生了某事。如:
It won’t be long before he succeeds. ( = He will succeed soom.)
It was ten years before they met again. ( = They met again ten years later. )
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