the reason why is that是定語從句。定語從句中,關(guān)系詞選用關(guān)系代詞(that,which,who等)還是關(guān)系副詞(when,where,why)取決于先行詞在從句中做什么成分。

The reason why…is that…做…的原因是…，其中why引導(dǎo)的是定語從句，that引導(dǎo)的是表語從句，that不可以省略。一個(gè)句子中有兩個(gè)從句，是一個(gè)非常好的高級句式。

例如：The reason why he was late for school was that he got up late.他上學(xué)遲到的原因是他起床晚了。

注意事項(xiàng)：同學(xué)們在使用這個(gè)句型時(shí)常犯的錯(cuò)誤是：1.意識不到why和that后所跟的都是從句，僅憑漢語意識寫句子，不會套用句式。2.誤把that用成because

例如：The reason why was that he got up late. ×

The reason why he was late for school was that got up late. ×

The reason why he was late was because he got up late. ×