Question

用until/not...until连结下列句子 1.We,wait,they,finidh the work

2.the students,keep running,the teacher,ask them to stop
3. I,listen to the music,the program,be over

Answer 1

1. We will wait until they finish the work.
2. The students kept running until the teacher asked them to stop.
3. I listened to the music until the program was over.
三句话until都是直至……为止，表示主句动作或状态持续至until的动作（状态）为止。
这三句话都无法用not...until...结构。
not...until...结构中的not的动词是终止性动词，意思是直至until的动作（状态）才（发生）主句动作的。
如：
He didn't come until I left. 直到我离开，他才（发生）离开（动作）。