I can't ____(walk) because my feet hurt.

问题描述:

I can't ____(walk) because my feet hurt.

I can't _walk___(walk) because my feet hurt. (应该是用原形吧)

填 walk 原形.
只要是跟在助动词 can / may / do 这些后面,不管语气是肯定还是否定,一律都是原形.