until 前面可不可以用was doing 为什么用his father was sitting in the sofa when he came in 而不用为什么用his father was sitting in the sofa when he came in 而不用his father was sitting in the sofa until he came in

until 前面可不可以用was doing 为什么用his father was sitting in the sofa when he came in 而不用为什么用his father was sitting in the sofa when he came in 而不用his father was sitting in the sofa until he came in
until 前面可不可以用was doing 为什么用his father was sitting in the sofa when he came in 而不用
为什么用his father was sitting in the sofa when he came in 而不用his father was sitting in the sofa until he came in

until 前面可不可以用was doing 为什么用his father was sitting in the sofa when he came in 而不用为什么用his father was sitting in the sofa when he came in 而不用his father was sitting in the sofa until he came in
was sitting 正坐在沙发上 表示某一时刻的动作 when 接的时间点 他进来的那一刻
until 在...之前 是一段时间 表示 他进来之前 他父亲一直坐在沙发上 显然不符合题意
望采纳!

他的父亲坐在沙发上和他进来是同时发生的，如果用until就是这个意思他的父亲一直坐在沙发上直到他进来，这个动作就存在刻意性，而前面的那句话就是他回来的时候他的父亲正坐在沙发上，这个动作带有巧合，只是恰好。

我觉得是时态问题
When he left the house, I was sitting in the garden.

When he arrived home, it was just nine o'clock.

until [常用在否定句中](=before)在...以前; 直到...才; 不到...(不)
until his ...

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我觉得是时态问题
When he left the house, I was sitting in the garden.

When he arrived home, it was just nine o'clock.

until [常用在否定句中](=before)在...以前; 直到...才; 不到...(不)
until his death
until four o'clock

He did not go until night.

It was not until yesterday that I noticed it.

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until前不能用was doing. was doing 是个过去进行时所以不行！

先来段解释：
①介词 prep.
1.直到...时,到...为止
Will this fish keep until tomorrow?
这鱼能搁到明天吗?
2.(用于否定句)在...之前,直到...(才)
She didn't go to bed until eleven o'clock.
她直到十一点才上床睡觉。
②连接...

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先来段解释：
①介词 prep.
1.直到...时,到...为止
Will this fish keep until tomorrow?
这鱼能搁到明天吗?
2.(用于否定句)在...之前,直到...(才)
She didn't go to bed until eleven o'clock.
她直到十一点才上床睡觉。
②连接词 conj.
1.直到...时,到...为止
He worked in Hong Kong until his father found him a job in Canada.
在他父亲给他在加拿大找到差事前,他一直在香港工作。
2.(用于否定句)在...以前,直到...才
She didn't go to bed until her daughter came back.
她一直等到女儿回来才去睡觉。
针对上题：
1、把until的意思带进第二句话（直到他进来，他爸爸正坐在沙发上），根本不通。
2、until前一般不加进行时（包括现在进行时，过去进行时和将来进行时）
（补充）3、至于when的用法，它的前后随便你加神马时态基本都可以，但一般只有进行时和一般时（一般现在时，一般过去时和一般将来时），而且两个动作用when连接时，时间持续长的用进行时，时间短的用一般时。
有任何看不懂的地方吗？可以再问哦~~

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