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。
2、強調狀語：
(1)強調時間狀語。
例如：
It was at that moment that he changed his mind.是在那一刻他改變了主意。
It is every day that Professor Smith goes swimming.史密斯教授是天天去游泳。
It was not until Saturday that he began to prepare for the examination. 他直到星期六才開始為考試作準備。
注意：這句話的原句是He did not begin to prepare for the examination until Saturday. 變成強調時間狀語，注意 “not” 位置的變化。
(2)強調地點狀語。
例如：
It was in the library that I met Jack yesterday.是在圖書館我昨天碰到了Jack.
原句：I met Jack in the library yesterday.
It might have been on the bus that I lost my purse.可能是在公共汽車上我丟失了錢包。
原句是：I might have lost my purse on the bus. 強調地點狀語，
也可改為：It was on the bus that I might have lost my purse.
It was under the tree that I was sitting then. 當時我正坐在那棵樹下。
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