does和doesn't和did和didn't分别怎么用?用于什么?

does和doesn't和did和didn't分别怎么用?用于什么? didn't和doesn't有什么区别 用“do,does,did,don’t,doesn’t,didn’t”填空. wasn't 和didn't怎么用 英语改否定句的问题什么句加didn"t和don"t和doesn"t 什么时候用does/doesn't 和isn't/is are/aren't can’t 和 won’t didn’t doesn’t 的区别是啥 doesn't have和doesn't has有什么区别 The boy read nothing,___he?A.did B.doesn't C.does D.didn't He saw nothing,____he?A.does B.doesn't C.did D.didn't 有do does 和don't doesn't 是不是都用原形啊 don`t和doesn`t与can`t怎么分辨?