no sooner引导什么从句?

no sooner + 主句 than + 从句，引导时间状语从句，主句用过去完成时,“than”后面的从句用一般过去时。

例句

No sooner had she said it than she burst into tears.

她刚一说完，泪水便夺眶而出。

No sooner had we sat down at the table than the phone rang.

我们刚在桌子旁坐下，电话铃就响了。

No sooner had I sat down than there was a loud knock on the door.

我刚坐下就有人大声敲门。

No sooner said than done.

说到做到。

No sooner had she fallen asleep than she heard a knock at the door.

她刚睡着就听到了敲门声。