we fould that doing exercises without teachers help is diffcult为什么do erercises 用doing ererciseswe found that doing exercises without teachers help is diffcult
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we fould that doing exercises without teachers help is diffcult为什么do erercises 用doing ererciseswe found that doing exercises without teachers help is diffcult
we fould that doing exercises without teachers help is diffcult
为什么do erercises 用doing erercises
we found that doing exercises without teachers help is diffcult
we fould that doing exercises without teachers help is diffcult为什么do erercises 用doing ererciseswe found that doing exercises without teachers help is diffcult
we found that doing exercises without teachers help is diffcult
这句话found后面有个宾语从句,在宾语从句中 句子的主语是doing exercises,只有名词或者动名词可以做主语,所以这里用doing,也就是do的动名词形式
用动名词形式做从句的主语
你found打错了
we found that +宾从,宾从中主语为动名词
we found that doing exercises without teachers' help is difficult.