not until + 从句 ,+主句（部分倒装）例如：not until he came back did I finished my home work .（直到他回来我才完成作业）
至于时态就要根据实际的句子在能决定,没有说一定用什么时态的求采纳！^_^John ，you can not go out play until your homework().是用has finished还是 is finished为什么？我觉得是has finished吧，因为is是be动词，finish也是动词，两个动词同时出现在一个句子就有冲突了。求采纳！^_^求采纳！^_^