After helping his mother do housework,he reviewed his class.他帮完妈妈干家务，才去复习功课.中有"才"是不是应该用until如果要用until的话，就写成：He didn't review his class until finished helping his mother do housework.until后不是跟动名词吗不会，后面应该跟完整句子，如果是用的动名词的话，应该是省略句