强调句型
1.强调句：It is/was +被强调部分+who/whom/that
2.被强调的主语是人称代词时，既可用主格，也可用宾格.
3.在强调部分时，可用only/particularly/also等强调性副词，进一步加强语气.
例：It was only Tom who protested.
4. 强调句it和先行词it的区别：如果把it is (was) that去掉，剩下的仍能组成完整的句子，就是强调句.
例：
It is clear that not all the students like English.
It was this place that I met Tom.
5.强调句式的疑问形式
如：why is it that; what is it that 等等
When I try to understand _____ that prevents so many Americans from being as happy as one might expect, seems to me that there are two causes.
A) why is does B) what it does
C) what it is D) why it is
6. 强调句中的时态应保持一致.
例：It was my two sisters who knew her best.
7.not until 句型的强调
例：It was not until 10 o’clock that he went to bed.
Not until he finished the homework did he watch TV.