为什么用that不用which引导定语从句?


【问】

In 2017, Li Ziqi uploaded her first video on YouTube ____ was about how to make a dress using the skins of grapes.

答案:that

是不是用which也可以?

【答】

在定语从句中,当指“物”的先行词有序数词修饰时,通常用that而不是which指代。本句先行词video有first修饰,所以用that不用which。

类似的用that不用which的情况还有:

  1. 最高级修饰先行词,如:This is the best film that I have even seen.
  2. any、only、ever等修饰先行词,如:It was the only novel that I read before school.
  3. 先行词是不定代词,如:We used anything that we could find to make candles to see the words.

特别需要注意的是,当先行词是“人”时,无上述限制,用that或who/whom均可。如:

  • He is the only person that/whom I believe in.