強調句：英語的強調主要有兩種：一是強調非謂語(包括主語、賓語、狀語等)；二是強調謂語動詞。
(一)強調非謂語
其基本句型是：“It + is/was + 被強調的成分 + that/who + 其她成分”。It 沒有實意，只起語法作用，引導被強調的部分。當被強調的是人時，可用who(m)/that, 其他情況用that。
例如：
It was I who/that met Jack yesterday. 是我昨天碰到了Jack.(強調主語)
It was Jack that/whom I met yesterday. 我昨天碰到的是Jack。(強調賓語)
It was yesterday that I met Jack. 是昨天我碰到了Jack.(強調時間狀語)
這幾句話復原為非強調句就是：I met Jack yesterday.
It is people, not things, that are decisive. 決定的因素是人，不是物。(強調主語)
It is because the book is very important for my present job that I bought it. 是因為這本書對我目前的工作很有用，我才買了它。(強調原因狀語)
It was in the supermarket that I gave the book to him. 是在那家超市裡我給了他那本書。(強調地點狀語)
1、強調主語：
It was John who broke the window. 是John打破了窗子。
原句：John broke the window.
It is this overpass that will be pulled down. 將被拆掉的是這個天橋。
原句：This overpass will be pulled down.
It is the people who/that are really powerful. 真正有力量的是人民。
原句：The people are really powerful.
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