(3)_____ he realized it was too late to return home.
A. Not until dark B. It was until dark that
C. It was not until dark that D. It was dark that
注意：如果not...until放在句首时就要用部分倒装句式，它的语序和在not...until结构中由until引导的短语(或从句)表示时间状语的句型中的语序不同。
6. 强调词it与先行词it的区别。
强调词it与先行词it的区别可以通过恢复原句的方式来判断，即如果把it is...that...去掉后剩下的成分仍然能组成一个完整的句子，这就是强调句型，否则就不是。
It is there that accidents often happen.
→ Accidents often happen there.
以上就是强调句型，被强调成分是状语，把it is...that...去掉，还原成后来的非强调句。
It is clear that not all boys like football.
上面的句子如果去掉it is...that...后就成了Clear not all the boys like football.很显然这不是一个完整的句子，因此不是强调句型，而是由it作先行词引导的一个主语从句。
7. 其他的一些强调句型：
It is/was+时间段+since从句，
It +时间段+before从句，
It is/was+时间点+when从句。
1)It is/was + 时间 + since …，从……已多久了。在这个句型中，主句通常用一般现在时，since从句用过去时，表示一个时间点。
e.g.(1)It is five months since I arrived in New York. 我到纽约已五个月了。
(2)It is five months since I was in New York.我离开纽约已经五个月了。
注意：例句中five months是作为一个整体看待的，所以用it is。在这类句子中，终止性动词表示从动作发生时算起;如果是状态动词或持续性动词，则从动作或状态结束时算起。
2)It is + 时间+ before …。在这个句型和上面一个句型中，时间都是时间段，如years，five days，twenty minutes等。不过主句的时态多用一般将来时或一般过去时，从句的时态要根据主句的时态进行变化。Before前的主句如果是肯定的，翻译成“在……之后才……” 主句如果是否定的，翻译成“不久就……”
e.g.(1)It was long before he gave an answer.
过了好久他才答复我。
(2)It was not long before he worked out the difficult maths problem.
不一会儿他就把那道数学题解出来了。
(3)It will be years before he comes back.
过几年他才回来。
(4)It was five o’clock A he came to see me.
It was at five o’clock B he came to see me.
It is five years D I left school.
It was five years C he joined the army.
A. when B. that C. before D. since
3)It was + 时间 +when从句
在上述句型中it指时间，when引导的是时间状语从句
e.g.(1)It was at midnight that I got back home yesterday.
(2)It was midnight when I got back home yesterday.
第一句是强调句型，被强调的时时间状语，因此用介词短语表达，而第二句是一般句型，时间以名词的方式表达，用来作表语。
总结：高考英语备考就介绍到这里了，希望能帮助同学们更好的复习本门课程，更多精彩学习内容请继续关注精品学习网!
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