高二英语It句型大扫描
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。
二、谓语动词的强调
it is...that...结构不能强调谓语，如果需要强调谓语，用助动词do, did或does。如：
do come here tomorrow.
he did write to you last week.
mary does study hard now.
三、练习
1. — he looks unhappy.
—yes, but he can’t say what it is ___ is bothering him.
a. as b. that c. what d. which
2. (1) it was not until i had read your letter __c_ the truth.
(2) not until i had read your letter _a___ the truth.
a. did i learn b. i didn’t learn
c. that i learned d. that i had learned
3. you fix my what? it was to get my brakes repaired____ i brought my car in, not to get the engine replaced!
a. so that b. when c. that d. because
4. it was some time ___ we realized the truth.
a. when b. until c. since d. before
5. was it when he was training in the field _____ the captain got hurt?
a. when b. that c. how d. where
