I know him better than you do.这句话中为什么最后加了个do

I know him better than you do.这句话中为什么最后加了个do I know him better than you do这儿为什么用vt.结尾 I know better than do you &I know better than you do是一样的吗? 请问I know you better than he does.与I know you better than him You can do better than( )A.him and hers B.he and me C.I and I do better in running than him.(改为同义句) 翻译一下Do you know better than the doctor? 《我相信》最后一句是i do believe.这句话为什么有个do? You can do better than You can do better than ( ) . Americans work a lot harder than you do.句子最后为什么有个do? i know you mean and i will do it better!