up to和until的区别

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up to和until的区别
up to和until的区别

up to和until的区别
up to...最多...至多...
The classroom can hold up to 50 students.
这教室最多能装下50名学生.
until 直到...
He did not leave until 7pm.
他直到晚上7点才离开.

up to 从事于(坏事), 忙于, 胜任, 能做, 适合, 适于
come up to step up to put up to face up to look up to
It's up to you.
until 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）...

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up to 从事于(坏事), 忙于, 胜任, 能做, 适合, 适于
come up to step up to put up to face up to look up to
It's up to you.
until 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 .
Not until we pointed out their fault to them did they realize it .

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