→ It was not until he saw her that he felt happy.
③I did not have an opportunity of seeing them again for several years.
【强调句式怎么用】→ It was not for several years that I had an opportunity of seeing them again.
④I did not do it for myself.
→ It was not for myself that I did it.
6、强调句和限制性定语从句的区别
⑴ 强调句的“黄金法则”：在强调句型中，任何情况下使用It和that都不会错 。注意：使用了it和that的句子并不一定都是强调句 。
⑵ 强调句中的that是个虚词，在句中不充当任何成分，无实在意义，仅起着标志性作用，有时可以省略 。
定语从句中的that作用有三：
一是引导定语从句
二是指代先行词，表示人或物
三是代替先行词在从句中充当主语、宾语或状语等成分 。充当宾语时常常可以省略 。
⑶ 强调句的谓语动词一般只能是现在时或过去时的单数形式is和was，偶尔根据需要可采取复杂的形式 。如：
It must have been his father that you saw just now.
It might be his father that you’re thinking of.
但定语从句的谓语动词则有时态、语态、语气等各种形式的变化 。
⑷ 强调句的“判别方法”——强调句如果去掉了It is/was … that …还可以还原为一个正常语序的陈述句，而且保持句子的结构完整，意义不变 。而定语从句去掉关系代词或关系副词后，则通常需要还原成为两个简单句 。试比较：
It is the tool that is most needed.（强调）
→The tool is most needed.
This is the tool that is most needed.（定从）
→This is the tool. The tool is most needed.

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