英语语法强调句知识点：不要误用which替代强调结构中的that

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　　根据英语强调结构的基本格式it is (was)that (who)可知，不管被强调成分为指时间或地点，还是指原因或方式等，其后一律要用that，不可用when, where, why, how等。至于其中的who，它只用于被强调成分指人的场合。如：

　　他是昨天晚上才第一次亲她。

　　误：It was last night when he kissed her for the first time.

　　正：It was last night that he kissed her for the first time.

　　我昨天是由于想买本字典而进城的。

　　误：It was because I wanted to buy a dictionary why I went to town yesterday.

　　正：It was because I wanted to buy a dictionary that I went to town yesterday.