I konw a number of occasions when people died from water pollution为什么用when?

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I konw a number of occasions when people died from water pollution为什么用when?
I konw a number of occasions when people died from water pollution
为什么用when?

I konw a number of occasions when people died from water pollution为什么用when?
因为前面是 occasions 场合,记住吧!

occasion (= 场合,时机) 的形容词是 occasional (= 临时的,偶然的),由它构成的词组 on occasion (= 有时,间或 ),可见它是一个偏重于“时间”概念上的词;
people died from water pollution 是定语从句,定语从句中主、谓、宾齐全,先行词 occasions 只能在定语从句中作状语,所以用关系副词 when(= on...

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occasion (= 场合,时机) 的形容词是 occasional (= 临时的,偶然的),由它构成的词组 on occasion (= 有时,间或 ),可见它是一个偏重于“时间”概念上的词;
people died from water pollution 是定语从句,定语从句中主、谓、宾齐全,先行词 occasions 只能在定语从句中作状语,所以用关系副词 when(= on which) ;
句子的意思:我了解到很多场合,人们因水源污染而死亡。

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