my foot hurt 还是hurts

my foot hurt 还是hurts His leg hurt还是hurts he--- (hurt)his foot badly 为什么不用hurts I hurt my foot.为什么用hurt my leg hurts为什么hurt加s my head hurts hurt为什么加s the hurt in my foot his words （ ） my feelings.请问是用hurt 还是hurts? My arms hurt.为什么是hurt而不是hurts? my legs hurt和my leg hurts 那个正确? my tail hurts 和 my tail is hurt 的区别 I cut my knee.It hurts.hurt为什么加s