前一个polluted为过去分词,属定语从句中的谓语,后一个为过去式,属主句的谓语.句意为:曾被污染的那条河污染了另一条河。

The river which had been polluted polluted another one.

youdao

比如“write”一词，有该词的原形的“write”、第三人称单数的“writes”、过去式的“wrote”以及过去分词的“written”。 是把它们算为4个单词呢，还是算为1个单词？

Should “write”, “writes”, “wrote”, “written” count as four words or one?

youdao

今天下午，她学习了十五个动词以及它们的过去式和过去分词。

She studied fifteen verbs about their past tense and past participle this afternoon.

youdao