when did you start working?I started work when I was twenty-two为什么第一句work 是动名词,第二句是原先.

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whendidyoustartworking?IstartedworkwhenIwastwenty-two为什么第一句work是动名词,第二句是原先.whendidyoustartworking?Is

when did you start working?I started work when I was twenty-two为什么第一句work 是动名词,第二句是原先.
when did you start working?I started work when I was twenty-two
为什么第一句work 是动名词,第二句是原先.

when did you start working?I started work when I was twenty-two为什么第一句work 是动名词,第二句是原先.
start working是开始上班,start doing强调一直在工作中
start work是开始工作,后来可能不再从事同一项工作了,或者说话时已经退休了,这是语言的外延,老师不会讲到这些的,要靠自己多年的经验来总结才能得出这样的结论的

第一个working 是因为start doing sth;第二个原形是因为过去式后接原形