一...就...
相似的还有hardly... when , no sooner ...than
如果scarcely, hardly, no sooner 被放在句首则要用倒装语序
Scarcely had she entered the room when(before) the phone rang.
她一进屋电话就响了.
Hardly had he arrived when she started complaining.
他刚一到,她就开始抱怨.
No sooner had he arrived than the trouble started.
他刚一到,麻烦就来了.