the reason why··· 是在定语从句中,reason为先行词。why是关系副词。后面加完整的句子,如:This is the reason why i came late. i came late.此句是完整的句子。
the reason that····也是定语从句中,reason为先行词,that是关系代词,代替先行词在从句中做成份(做名词能做的成份,如主语,宾语等),也就是说,that后面的句子一定的缺成份的。如:The reason that he told me is not reasonable. that he told me 这个从句中,told缺宾语,应该是tell sb. sth. 所以that在从句中做tell的宾语。
在做题时一定分析好从句的句子成份,是否缺成份是关键,缺成份选that,不缺选why
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