until 和not until 的区别

until 和not until 的区别

not … until,until

A.until表示动作、状态的持续,强调“一直到……为止”,或强调某个动作或状态一直持续到另一个动作或状态出现之前.常与表示延续性动作的动词连用.

如：* I waited until three o’clock,but he didn’t come.* He lived with his parents until he graduated from college.

B.not … until表示“到……为止；直到……才”,常与表示瞬间性动作的动词连用.

如：* The noise of the street didn’t stop until midnight.* The children didn’t come home until it was dark.* I didn’t know the truth until you told me.

until 与not until的用法区别！

until在表达方式和意义上的特殊性：until是till的强调形式,但是它们表达的意义是相同的,都表示"直到某时".不过,当主句是

否定句时,它引出的意思是"直到（某时）（某动作）才（发生）" ,这时候常会出现"not until …"的结构,如果将 "not until

…"的结构放在句首,那么主句要写成倒装句.例如：

He didn't go to sleep until 12 last night .

他昨晚直到十二点钟才睡觉.

另外,Not until …在句首,主句用倒装.

Not until the early years of the 19th century did man know what heat is.

直到19 世纪初,人类才知道热能是什么.

Not until I began to work did I realize how much time I had wasted.

直到我开始工作,我才认识到了我已蹉跎了几多岁月.

(2) It is not until… that…