①was/were doing sth. when-did sth.(正在做 某事.这时突然--) I was reading a book when the bell rang . ②was/were about to do sth. when-did sth. (正要做某事.这时突然-) We were about to leave when the telephone rang .
⑥It the first/second/third-time+ that did / had\have\ has + done 结构中,that-从句通常用过去完成时,有时也用一 般过去时,有时若有包括现在在内的时间状语,偶尔还可用 现在完成时：
I was lucky because that was the second time I(had) visited Japan that year.我很幸运,那是我那年第二次访问日本.
I was about to go out when it began to rain.
2.我正在做作业他就打电话给我。
I was doing my homework when he phoned me.
3.他一到学校就下雨。
No sooner had he got to school had he got to school when it began to rain. He had no sooner got to school than it began to rain.
It was the first time this year that hhe adn’t [hasn’t] work on a Saturday.这是今年来他第一次在星期六不上班.
This is the first time I have been here. 这是我第一次 来这里。
It'll be the first time I have spoken in public. 这将是 我第一次在公共场所演讲。
④It is/has been+时间段 since- did / have\ has + done 结构中,“自从.....有多长时间”，that-从句通常用过去完成 时,有时也用一般过去时。
It is two weeks since I came here. She said it was five hours since she had finished her
小结：用when引导时间状语从句的句型结构搭配 1.be about to do sth when 刚要,即将；正要做某事,突然 发生其他事 2.be doing sth when 正在做某事突然 3.had done sth when 刚刚做过某事突然 4.be at the point of doing sth when 就在做某事的关键时 刻突然 5.scarcely...when/hardly...when 几乎未来得及就…；刚 一…就… 6.no sooner...than 一…就… 1. 我刚要外出就下起了雨。
③Hardly- when-\No sooner- than- 都表示“刚 一……就……”，两个用法一样，可以互换。 如果要讲细微区别的话，就是hardly ..when ..更 紧凑一些，意思是“几乎未来得及做完A这件事， 紧接着就开始做B这件事”。 而no sooner.. than 意思是“刚做完A这件事，就做B这件事”。 两 者里面的hardly, No sooner如果放在句首，都必 须用倒装。 这是典型的过去完成时的句子。
work. ⑤It is the first/second/third-time+ that have/has
done...(第...次做某事)
It’s the first time Ihave seen her. 见到她 It’s the second timeWehave been there .到这里
--正语序：I had hardly got into the room when it began to rain. 我一进屋门就下雨。 No sooner had I got into the room than it began to rain. 我一进屋门就下雨。
--正语序：I had no sooner got intothe room than it began to rain.我一进屋门就下雨。
Hardly had we got in the crops when it began to rain.
我们已收完庄稼就开始下雨。
I had no soonercome into the room than the door was closed. 我一进屋门就关了。 Hardly had I got into the room when it began to rain. 我 一进屋门就下雨。
He had hardly got to school when it began to rain.
4.我们一做完试卷就下课。
No sooner had we finished the papers than class was over.