until 与not untill 的区别

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until 与not untill 的区别
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until 与not untill 的区别
until 与not untill 的区别

until 与not untill 的区别
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…