It/This is the last time that I shall give you a lesson.
8. why指原因,在定语从句中作原因状语,先行词通常为reason,不能省略。且why引导的定语从句只能是限定性定语从句。Why= for which
I don’t know the reason why he was late yesterday.
The reason why(for which) he was late is that he missed the bus.
※注:当先行词为reason时,关系副词并非都用why。
This is the reason (that/ which) he gave/ explained to us.
【判断用关系代词还是关系副词】
从句缺少的是主语、宾语还是状语是确定用关系代词还是关系副词的关键。试比较:
I will never forget the day (which/that) I spent in Hongkong.
( spent是及物动词,后缺宾语,因此用关系代词或省略 )
I will never forget the day when/on which Hongkong returned to its motherland.
( 从句主谓宾结构完整,缺状语,因此用关系副词或介词加关系代词 )
The reason (that/which)he gave for not coming to school yesterday isn’t believable.
( gave是及物动词,后缺宾语,因此用关系代词或省略 )
The reason why he didn’t come to school yesterday isn’t believable.
( 从句主谓宾结构完整,缺状语,因此用关系副词或介词加关系代词 )
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