使用强调句型的几个注意事项
1.被强调成分是主语，who/that之后的谓语动词应该在人称和数上与原句中的主语保持一致。It is I who am right.It is he who is wrong.It is the students who are lovely.
2.即使被强调成分是句子中的时间状语，地点状语，原因状语等，也不能用when，where, because，要用 that.
It was because of the heavy rain that he came late.是因为大雨他迟到了。
3.如果被强调的成分有同位语，同位语也应提前。It was from him，his chemistry teacher，that Paul learned to watch carefully in class.
4.被强调成分是作主语的代词，用主格，是作宾语的代词，用宾格。It was he that helped me yesterday. It was me that he helped yesterday.
