not until 和until 到底该什么时候用?比如You should begin to eat until every comes.和You shouldn't begin to eat until every comes.意思应该一样吧?如果一样怎么,一个加not一个不加,到底该什么时候加?如果不一样,

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not until 和until 到底该什么时候用?比如You should begin to eat until every comes.和You shouldn't begin to eat until every comes.意思应该一样吧?如果一样怎么,一个加not一个不加,到底该什么时候加?如果不一样,
not until 和until 到底该什么时候用?
比如You should begin to eat until every comes.
和You shouldn't begin to eat until every comes.
意思应该一样吧?如果一样怎么,一个加not一个不加,到底该什么时候加?
如果不一样,

not until 和until 到底该什么时候用?比如You should begin to eat until every comes.和You shouldn't begin to eat until every comes.意思应该一样吧?如果一样怎么,一个加not一个不加,到底该什么时候加?如果不一样,
until单独使用是“直到.”如"I waited until my mother came back"意思是我一直进行“等”这个动作,直到妈妈回来不做(等)这个动作了.not...until指“直到.才.”如“ I didn't go to bed until my mother came back”是指我原来没有做上床这个动作,是妈妈回来才上床睡觉的.所以你提出的那两句话,第一句的意思是你先开始吃,一直吃到每一个人都来了就停止不吃了,第二句话是你先不能吃,要等每一个人都到了以后才能开始吃.