be sure doing sth为什么不行?be sure 后接什么词性?may be是短语动词,后为什么可以直接接动

be sure+从句/be sure to do sth /be sure of sth/doing sth 有什么区别 she's sure to be successful.to be 后为什么是接形容词?而不是用名词success. no one can be sure 加句子是什么从句呢?为什么 sure 是什么成分 什么词性? be sure of sth 既然有be sure of sth,为什么宾语从句要用be sure that而不是be sure of that呢? be sure 短语用法 be sure to do sth和be sure of doing sth的区别 be sure of doing sth和make sure of doing sth有区别吗? be worried about后接sth还是doing sth? be sure这个短语指什么英文单词 sure的用法be sure of doing和 be sure to do有什么区别呀? be sure to 接什么词