——Have you finished to work out the maths problem?——Not yet

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——Have you finished to work out the maths problem?——Not yet ,because I find it difficult.
这里为什么是finished to work 而不是finished working 呢

finishe to do sth 是指完成正在做的事,要去做另一件事
此题中意思是说你完成手头的工作,再去解决数学问题吗?
没完成（手头上的事呢）,因为手头上的事也很困难,不易解决!
finish diong sth 完成正在做的事情

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