一、強調句型的用法
在英語中，我們常用It is/was… who/that結構來突出強調句子的某一成分(一般是句子中主語，賓語或狀語)。在這個句型中，it沒有詞彙意義，只是引出被強調的'成分。如果被強調的成分是表示人的詞，用who或that來連接都可以。如果是其它成分，則一律用that來連接。
E.g. It is my mother who/that cooks every day.
E.g. It was yesterday that Tom passed in the math exam.
二、使用本句型的幾個注意事項
1.被強調成分是主語，who/that之後的謂語動詞應該在人稱和數上與原句中的主語保持一致。
e.g. It is I who am right.
e.g. It is he who is wrong.
e.g. It is the students who are lovely.
2.即使被強調成分是句子中的時間狀語，地點狀語，原因狀語等，也不能用when，where, because，要用 that。
E.g. It was after the war was over that Einstein was able to come back to his research work again.
E.g. It was in front of the bank that the old lady was robbed.
E.g. It was because of the heavy rain that he came late.
3.如果被強調的成分有同位語，同位語也應提前。
It was from him，his chemistry teacher，that Paul learned to watch carefully in class.
4.被強調成分是作主語的代詞，用主格，是作賓語的代詞，用賓格
It was he that helped me yesterday. It was me that he helped yesterday.
5.被強調部分既包括人又包括物，用that不用who
It were the things and people that they remembered that they were talking about.
三、區分定語從句和強調句型某些定語從句和強調句型形式差不多，容易混淆。
如果去掉it is/ was 句子仍然通順成立，則爲強調句型，不成立不通順，則爲定語從句。
E.g. It was three years ago that he went to American for a further study·去掉It was that句子爲Three years ago he went to America for a further study.句子通順，意思完整，那麼，這就是一個強調句型。
