強調句型結構及用法如下：
1、如強調句型指現在或未來的情況用It is指過去用It was。
It is I who/ that am wrong.
分析：被強調部分為人強調詞可用who也可用that.指現在的情況所以以It is開頭，被強調部分是I謂語用am。
原句：I am wrong.
It was him who\that I saw the day before yesterday.
原句為I saw him the day before yesterday.
分析：指過去的情況用It was開頭，被強調部分為人所以強調詞仍是who\that。
2、被強調部分往往為句子的主語、賓語、時間狀語、地點狀語等，但有時也可以強調比較復雜的內容。如時間狀語從句、地點狀語從句、not until結構、not onlybut also和as well as等結構。
It was only when I reread his poems recently that I began to appreciate their beauty. (appreciate means understand and enjoy the good qualities or value of something欣賞、鑒賞、領會）
分析：強調部分為復雜的時間狀語從句強調詞不能使用when只可用that。
It is not only he but also his parents who\that have been to Beijing.
3、被強調部分為人稱代詞時，原句用什麽格強調句也用什麽格，如上述例句。
4、關於強調詞的選用，強調人時可用who或that，如果不強調人壹律用that。此時絕不能與定語從句混淆，被強調部分為時間狀語、地點狀語、或原因狀語時不可誤用when, where或why。
It was in the street that I met him yesterday.
盡管被強調部分是地點狀語，強調詞不能使用where只可用that.
It was about 600 years ago that the first clock with a face and an hour hand was made.分析：指過去的情況用It was開頭，盡管被強調部分是時間狀語，強調詞不能使用when只可用that. It was because he was ill that died at once.被強調部分為復雜的原因狀語從句強調詞不能使用why只可用that。
5、被強調部分如果為主格人稱代詞，who\that後的動詞和主格人稱代詞在人稱和數上保持壹致。
6、強調句型的壹般疑問句結構Is\Was itwho\ that？
Was it during the Second World War that he died?
分析：以Was it開頭被強調部分是時間狀語，強調詞用that。