have done doing是啥啊？？
全句是：'You've never done much walking, have you? I don't think you could walk the five miles to our cottage!'。第一句为啥不是You've never walked so much?have done doing是咋回事？ 没有什么have done doing的结构，这里是do walking（步行）的完成式。“do+动名词”表示“做某事”，是英语中的常见用法，其他如：do reading（读书），do washing（洗衣）等。 做运动动词用do，习惯用法 两种写法都可以，注意 do . . . ing 限定词不能省略。We use do in the informal structure do . . . ing to talk about activities that take a certain time, or are repeated (for example jobs and hobbies). There is usually a determiner (e.g. the, my, some, much) before the -ing form.
I'm going to do some walking . . .
I hate doing the ironing.
Note the -ing form in this structure is noun-like, and cannot have an object.
NOT: I'm going to doing some watching TV.
But do can be used with a compound noun that includes verb + object.
It's time I did some letter-writing.
来源：Practical English Usage walking说的是exercise。 多谢各位老师指点
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