for certain和certainly的区别为什么可以know for certain 而不是know certainly

for certain和certainly的区别为什么可以know for certain 而不是know certainly know for certain是什么意思? for certain reason还是for a certain reason standard deduction for certain filers for certain=certainly吗? 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 certain certain certain for certain 是什么意思啊详细些啊 what are the causes for certain crimes make certain of和be certain of的区别? for sure 与 for certain 有什么不同 some 和certain的区别有哪些? certain和sure有什么区别 All i really know for certain 如题~ we have reached a certain respect for each other