not until:可放句首,但主句要用倒装．
Not until midnight did he came back home.
还有一种用法与until相似．
He did not come back home until midnight.
He did not go until night.
他直到夜里才走.
It was not until yesterday that I noticed it.
直到昨天我才注意到这件事.
Don't go out until four.
不到4点不要出去.
They don't open up until 8:30.
他们8：30才开门营业.是自己写的么可以参考