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關閉窗口 強調句的具體使用情況，現在分述如下：
強調主語
主語指人時，可以用that或who；主語指物時，只能用that。例如：
It was John that (who) wore a white suit at the dance last night.
It was a police officer that (who) signaled him to stop.
It was a bunch of red roses that she left us.
It is what he said that I failed to recall.
主語是人稱代詞時，一般用主格，在非正式文體中也可以用賓格。例如：
It is me who am to blame.
強調賓語
如果賓語指人，可以用whom 或who替代that，例如：
It was John and his brother that (who, whom) we met in the park last week.
It is me that (who, whom) he gave the book.
但是It is me he gave the book to.和 It is to me he gave the book.更常用，所以間接賓語常常被介詞賓語所代替。
強調介詞賓語
It was the children that he gave the apples to.
It was to me that Mother gave a new pen. (正式文體)
It was me that Mother gave a new pen to. (非正式文體)
It was to me that she showed the picture.
It was Miss Wang that he sent the postcards to.
It is for you that I bought this dictionary.
強調時間狀語
It is at ten that the train leaves.
It was when she was about to go to bed that the telephone rang.
It was not until 1972 that we began studying English.
I was after I entered the university that I came to know how to behave myself properly.
強調地點狀語
It was here that (where) we met Mary.
It was in your room that I left my gloves.
【注意】如果被強調的是地點副詞，除了用that外，還可以用where。如果被強調的是時間副詞或短語(不帶介詞) ，除了用that外，還可以用when。如果被強調的地點或時間是介詞短語，則不能用when 或where，只用that。例如：
It was yesterday that (when) he bought an English book in town.
It was last week that (when) we worked in the countryside.
It is here that (where) he must wait for her.
It was in this room that we had a heated discussion.
It is at ten o’clock that the meeting will take place.
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