英语里not……until怎么用啊

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英语里not……until怎么用啊

英语里not……until怎么用啊
英语里not……until怎么用啊

英语里not……until怎么用啊
Don't get off the bus until it stops.(主句是祈使句从句用现在时)
He didn't go to bed until his mother came back.(主句是过去时,从句时态一致)
He won't call you until he finishes his work.(主句用一般将来时,从句用现在时)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.
They didn't realize their fault utill we pointed it out to them .
直到我们向他们指出了他们的错误,他们才意识到.
Not until we pointed out their fault to them did they realize it .
直到我们向他们指出了他们的错误,他们才意识到.
1.用于肯定句中:
1) It may last until Friday.这可能要延续到星期五.
2) He will be working until 5 o'clock.他将一直工作到五点钟.
3) She was a bank clerk until the war,when she trained as a nurse.她战前是个银行职员,战时受训当了护士.
不难看出until 用于肯定句中,表示句子的动作一直持续到until短语所表示的时间为止,即表示动作的终点.一般可译为“直到……时(为止)”或“在……以前”.在这种用法中,句子的谓语动词必须是持续动词(非瞬间动词),如live,wait ,last,love,like,stay,work,continue 等.
2.用于否定句中:
1) The secret was never told until after the old man's death.这个秘密在老人去世后才说出来.
2) Don't open it until your birthday.等到你过生日那天再打开.
3) She didn't sleep until eight.她八点钟才睡觉.
一般译为“直到……才”或“直到……之前(……还不)”