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▲一般说来，原句是现在时、将来时、现在进行时、现在完成进行时、现在完成时等，变强调句时用 is；原句为过去时、过去进行时、过去完成时及与过去有关的时态，要用 was 。例如：It is this hero that you have to learn from. 你就应当向这位英雄学习。It is a scientist that you will be. 你将来要当的是一名科学家。It is for ten years that she has been waiting for you. 她等你等了10年。It was a Russian song that he said he would sing. 他说他要唱一首俄文歌。It was the first past that he had finished before he wrote the second part. 在他写第二部分之前，他写完的是第一部分。▲但是，如果有关人员仍然活着或者有关事物对参与者来说仍然历历在目，虽然原句是过去时，强调句也可用it is … that。例如：It is chairman of the department that the teaching staff elected him. 全体教师选他当系主任。It is he that cleaned the floor yesterday. 昨天清洗地板的是他。It is these very novels that Miss Green enjoyed reading as a pastime. 格林小姐用来作为消遣阅读的是小说。How long ago is it that you last saw her? 你最近见到他是多久以前的事？（薄冰编著：《英语惯用法词典》p.435）
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