certain&sure的区别?

sure certain的区别 indeed 与certain sure的区别 半助动词 be certain to be sure to 的区别 sure ,for certain 与certainly的具体区别 单词 positive,sure,definite,certain,的词性?区别?用法 be sure of和make sure of还有make certain of和be certain of的区别? certain 与 sure 的用法 certain和sure有什么区别 I'm sure to……和I'm certain to……的区别 be certain to do 和be sure to do 的区别 It's certain that it's sure that区别,语法, 高一英语改错+sure 和certain区别