certainly certain certainty 3个单词的意思都差不多..用法区别在哪呢?

for certain=certainly吗? for certain和certainly的区别为什么可以know for certain 而不是know certainly It's ___that a ____ Mr.Green called you and asked you to give him a call.A,certainly,certainly B.certain,certain C.certainly,certain D.certain,certainly sure ,for certain 与certainly的具体区别 为什么是are you certain 不是are you certainly they are certainly not mine这句话为什么不用certain,certainly是副词,为什么可以用在这里. for certain和certainly和surelyDo you know ______that robots would like to serve human beings?A.for certain B certainly C surely for certain和certainly和surelyDo you know ______that robots would like to serve human beings?A.for certain B certainly C surely some certain kinks of 是some certain kinds of music```打错字了OK!现在我知道是什么意思了 想问下是some certain kinds of music还是some certainly kinds of music 就语法来说用certain 还是certainly Certainly certainly certainly certainly It seemed certain that the plane would crash为什么不是certainly呢? it seem certain that their plane would crash 为什么不这么说 it seem certainly smoking will certain do harm to your health.还是用certainly They are certainly heroes,这句为什么不用certain,不是形容词修饰名词么? certainly certain certainty 3个单词的意思都差不多..用法区别在哪呢?