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When his mother asked him to wash his hands

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When his mother asked him to wash his hands
为什么是“ to wash”而不是 washed?
ask sb.to do sth.是固定的用法
再问: 这个句子是过去时,如果ask sb. to do sth.是固定的用法的话, 那就应该是“to washed”呀?
再答: 不定式后面没有时态变化,要是变就变前面的ask,将ask变成asked