He when to school when he was nine years old.为什么时态一致?

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He when to school when he was nine years old.为什么时态一致?
He when to school when he was nine years old.为什么时态一致?

He when to school when he was nine years old.为什么时态一致?
意思是:他在9岁时上学了.他9岁时已经过去,所以前面的动词用过去式.

译:他在九岁时上学(若when是went的话)
在过去某时做某事,均用一般过去时,当然应该一致啊