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问题: 关于when的固定句型。如hardly/scarcely ...when 等。愈多愈好!

解答:

hardly...when...; scarcely...when...; no sooner...than...一...就...
因为是先一。。。后。。。,所以前半部分用过去完成时,后面加一般过去时。
I had hardly arrived at home when it rained.我一到家就下起雨来了。