核心问题
《科技英语读译指南》(p.205)上说：“it后如果不是is或was绝非强调句型。”那么下列句子是不是强调句呢？
It may be his father that you're thinking of. (CGEL)
词典解答
准确说法应当是:在强调句中主句的动词形式通常是一般现在时(is)或一般过去时(was),但是并不能排斥带情态动词的形式:
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It would have been at that time he went to live in Wisconsin. 很可能就是在这个时候他去了威斯康星州住了下来。
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It may be my book that he is reading. 他正在读的可能就是我的书。
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It must have been the manager that spoke to you. (CGEL) 刚才跟你谈话的一定是经理。请做下面的英语试题：
Could it be in the room ____ we had a talk last night ____ you left your keys? A. that; where B. in which; where
cleft sentence 296 C. where; that D. where; where