Question

it was not yet eight o'clock when he arrived home

如果改用 before,that,until,原句该怎么改？

Answer 1

-Did Jack come back early last night?
-Yes.It was not yet eight o'clock_____he arrived home.
A.before B.when C.that D.until

答：选B

解析：句意为：-Jack昨晚回来得很早吗？-是啊，他到家时还不到8点。­

考生的思维定势有二：首先，认为是在考查强调句。同学们熟记了强调句型：It be+被强调部分+that/who+其余部分。而判断一个句子是否为强调句型，只需将其中的It is/was和who/that去掉，如果句子结构完整通顺，则是强调句型，否则就可能是其他语法形式。如果选C项，去掉It was和所填的that后，时间状语前缺少介词，句法错误，因此该句不是强调句型，而是状语从句。­

其次，认为是在考查it…before…句型。It is+时间段+before句型的肯定式表示“过多久……才、就”；否定式表示“不久……才、就”。此题如用before罗辑不符，故答案选B。­
(这段解释是从http://attach.etiantian.com/staticpages/study/question/question_6384668.htm粘贴来的，我恰好也做到这个题，看完这个懂了。个人认为此句只能用when，换作其他意思就变了)

Answer 2

He arrived home before eight o'clock.
It was not until eight o'clock that he arrived home .

Answer 3

He did not arrive home before eight o'clock.
It was not until eight o'clock that he arrived home.
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