I met Miss Li in the park yesterday.
1.即使被强调的主语是复数，也要用It is/was而不能用It are/were (主谓数要一致）；that后面从句的数则与要强调的部分的数一致；
More often it is the students, and not their class teacher, who want to go outing when spring comes.
2.当强调的主语是代词时要用主格
强调I：It was I who met Miss Li in the park yesterday.
3.当句中强调的部分是地点时间方式等状语时，其引导词仍用that，不能用why, when, where, how，以免同定语从句混淆
强调in the park：It was in the park that I met Miss Li yesterday.
强调yesterday：It was yesterday that I met Miss Li in the park.
4.当句中谓语是现在或将来时时，It’s…；如果原句谓语动词是过去时态时，要用It was…；
5.在强调“not…until”句子时，有一个固定结构It is/was not until…that+肯定式；
6.当强调的是人时，that可用who，若这部分作宾语，则who还可用whom；
强调Miss Li：It was Miss Li who/whom I met in the park yesterday.
7.特殊疑问句中，只有疑问词可被强调，其强调结构是如下固定形式：
疑问词+is/was+it+that…?
8.在强调一般疑问句中某一成分时，其强调结构是：
Is/Was+it+被强调部分+that+肯定式？
Did your brother join the army in 1978?
Was it your brother that joined the army in 1978?
9.强调句的be前可用表推测的can, may, must等情态动词及其过去式
It must be his brother that you saw.
1. 去掉强调句型中It is/was…that…这三个词，剩下来的词仍然是一个完整的句子。
2. 它可用强调主语、宾语、状语，但不能强调谓语和表语。
若要强调谓语，可用助动词或用其他方式
Do come again! 你一定得再来！
I do believe you. 我真的相信你！
3. 强调状语和疑问代词时，后一般用that，强调主语和宾语时，人可用that, who, whom，物则用that
4. 强调状语从句时，后一般用that，切不可用who, whom, which, when, where, why等代替that。若句型为not…until…时，强调until从句，应注意主句中not位置的转移
It is because I wanted to read this book that I bought it. （强调原因状语从句）
此句型不能强调让步状语从句和以since, as引导的原因状语从句。
5. 注意强调句型的特殊疑问句语序以及从句中的语序
When was it that she arrived in Nanjing?
I wonder who it is that is on duty today.
6. It is a + adj. +n. + that…的含义是“无论怎样……的……也不多/难免……”
It is a skillful workman that never makes mistakes.
无论怎样熟练的工匠也会有失手的事。
