问学必有师，讲习必有友，本文是敬业的小编小月月给家人们找到的until的正确用法【4篇】，仅供借鉴。
my mother had no idea of it until I told her.
否定句(瞬间动词)+until+名词或名词短语。
I won't leave until 12 o'clock.
方法一，句中谓语动词是延续性动词，用肯定句。句中谓语动词是瞬间动词(非延续动词),用否定句或含有否定词的句子。
方法二，和汉语意思一致，看句中动作是否做了，做了用肯定句，没做用否定句。
方法一与方法二并不矛盾，写句子时可任选其一。
注意：做选择填空题时否定句包括含有否定词的句子，最好先看一下答案有无until,如有先填一下看是否正确，如不行，再选其它答案。
结构：It is/was not until +从句/表时间词语+that +肯定句。
It was not until I told her that my mother had any idea of it.
4.not...until倒装句(否定句才能倒装，因为具有否定意义的词或短语在句首，句子部分倒装)
结构：Not until+从句/表时间词语+主句(倒装)Not until 12 o'ckock will I leave.
1.直到雨停他才离开。
解析：离开是瞬间动词应用否定句，离开这个动作在雨停前没做(没离开),是否定，所以用否定句，所以句子写成，He didn't leave until the rain stopped.
强调句It was not until the stopped that he left.
倒装句Not until the rain stopped did he leave.
2.直到他妈妈回来他一直在看电视。
解析：看电视是延续性动词应用肯定句，看电视这个动作在妈妈回来前做了，是肯定，所以用肯定句，所以句子写成，He was watching TV until his mother returned.