I happened_______(sleep) when he came back.

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I happened_______(sleep) when he came back.
顺便问一下happen的用法

to sleep
碰巧
happen
hap 运气+ -en 使成=make
vi
发生
The accident happened outside my house.
这个事故发生在我家房子的外面.
（与to连用）碰巧
I happened to be in the market yesterday when a fire started.
昨天发生火灾时,我正好在市场上
（与to连用）偶然发生；巧遇
I happened to be out when he called.
他来访时,恰巧我出去了.
（与on,upon连用）巧遇；偶然发现
I happened on just the thing I had been looking for.
我偶然发现了我所要找的东西.
happen to
发生（某事件）；对…产生影响
A bad accident happened to that family.
那个家庭发生了不幸的事情.

I happened_______(sleep) when he came back. i didn't sleep until he came back.句子改错! when he came back to when he came to see me,after he found out i came back to hom i didn't sleep until he came back.句子有错吗? When will he be back when will he come back When he came bac Do you know when he came back?Yes.At about twelve.I was just When John came back ,he found the bag he had my son pretended___when i came back A to sleep D to be sleep It was noon when he came back?是什么从句? i found the lights (开着)when i came back When i came back,I found nobody_________.It was empty.