I (like) these books very much.when were they( bought)为什么可以这样填空?为什么是“when were they( bought)”而不是“when did they bought?"

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I (like) these books very much.when were they( bought)为什么可以这样填空?为什么是“when were they( bought)”而不是“when did they bought?

I (like) these books very much.when were they( bought)为什么可以这样填空?为什么是“when were they( bought)”而不是“when did they bought?"
I (like) these books very much.when were they( bought)
为什么可以这样填空?为什么是“when were they( bought)”而不是“when did they bought?"

I (like) these books very much.when were they( bought)为什么可以这样填空?为什么是“when were they( bought)”而不是“when did they bought?"
这里是因为被动语态,
前面说我喜欢这些书,所以后面的they 指的就是书了,书只能被买,而且还是过去式,
所以是when were they bought 而不是when did they bought
被动语态就是be done

they 这里表示东西,要用被动的

这里的they是指这些books,book与buy之间是被动关系
如果把这里的they理解为人,句子应该是when did they bought the book?
另外,buy是及物动词,后面一定要宾语的