be sure to 和be sure of 区别和用法
问题描述：
be sure to 和be sure of 区别和用法
答
be sure to do表示说话人确信主语会如何.如He is sure to come back soon.他不久就一定会回来.be sure of +名词/代词/动名词.表示主语确信.He is sure of success.他确信他会成功.