while he____(walk)across the street,he saw a traffic accident____(happen).`填原型还是过去分词为什么

Question

如题所述

Answer 1

1. walked happen.
see sb./sth. do sth. 五看二听一感觉 其后面可以跟上V-ing 或者动词原形做宾补。V-ing 强调正在发生的动作。动词原形做宾补表示看到事情发生的全过程。

Answer 2

was walking
happen (see + sb + do sth) see 接无 to 不定式做宾补

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Answer 3

was walking
happening本回答被网友采纳