he+didn't+go+to+bed+until+his+parents+came+back+中能把until+换成before+吗,若换了意思变吗

he+didn't+go+to+bed+until+his+parents+came+back+中能把until+换成before+吗,若换了意思变吗
he+didn't+go+to+bed+until+his+parents+came+back+中能把until+换成before+吗,若换了意思变吗

he+didn't+go+to+bed+until+his+parents+came+back+中能把until+换成before+吗,若换了意思变吗
两者可互换使用,但含义略有不同.
一.Before表示“在… 之前”,而until表示“直到…才…”,主句肯定表示主句动作的终止时间,主句否定强调动作的起始时间.
1,主句为否定时,谓语动词为终止性动词.常见的动词有open,start,leave,go,arrive,finish,begin,stop,etc.For example:
1),The noise of the street didn’t stop before/until itwas midnight.
2),The children won’t come back until/before it isdark.
3),I didn’t leave the lonely boy before/until hismother came home.
2,主句为肯定式,谓语为延续性动词.这类动词有：stand,live,stay,talk,be,wait,etc.
For example:
1).He lived with his parents until/before he graduated from school.
2).I will wait before/until he comes to my help.
3).I shall stay here until/before you come back.
二.下列情况下宜用before不用until.
1.主句为肯定式,谓语为终止性动词时只用before.For example:
1).He fell asleep before I could take off his clothes.
2).We arrived there before it started to rain.
3).The holiday came to an end before I knew it.
4).He almost knocked me down before he saw me.

稍有不同：
用until不是他父母回来他就睡觉去了。
用before只是强调他父母回来之前他没去睡觉，但不一定是他们一回来他就去睡觉。

不能换哦亲
原句的意思是：他直（拖到）到他父母回来时才上床睡觉。（也就是说他还是上床睡觉了）
但是如果改了的话，意思就变成了：他没有在他父母回来之前上床睡觉。（即他没有上床睡觉）
希望能帮到你 :)

两者可互换使用，但含义略有不同。
一。Before表示“在… 之前”，而until表示“直到…才…”，主句肯定表示主句动作的终止时间，主句否定强调动作的起始时间。
1,主句为否定时，谓语动词为终止性动词。常见的动词有open, start, leave, go,arrive, finish, begin, stop, etc. For example:
1), The...

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两者可互换使用，但含义略有不同。
一。Before表示“在… 之前”，而until表示“直到…才…”，主句肯定表示主句动作的终止时间，主句否定强调动作的起始时间。
1,主句为否定时，谓语动词为终止性动词。常见的动词有open, start, leave, go,arrive, finish, begin, stop, etc. For example:
1), The noise of the street didn’t stop before/until itwas midnight.
2), The children won’t come back until/before it isdark.
3), I didn’t leave the lonely boy before/until hismother came home.
2,主句为肯定式，谓语为延续性动词。这类动词有：stand, live, stay, talk, be,wait, etc.
For example:
1). He lived with his parents until/before he graduated from school.
2). I will wait before/until he comes to my help.
3). I shall stay here until/before you come back.
二。下列情况下宜用before不用until.
1。主句为肯定式，谓语为终止性动词时只用before. For example:
1). He fell asleep before I could take off his clothes.
2). We arrived there before it started to rain.
3). The holiday came to an end before I knew it.
4). He almost knocked me down before he saw me.
祝你进步！

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