make sure, be sure of ,be sure to do，for sure的区别

make sure 确认、核实、查证，通常用于祈使句，后面加从句

be sure of +名词、动名词，表示“确信...”“对...有把握”，表示主语对抽象事物很确定

而be sure to do 表示说话人对主语作出判断，认为主语一定会怎样、必然会怎样

for sure 是一个副词短语，比如 I know for sure 我心里明白，后面也可以加句子

make sure : a) to find out something is true or to check that something has been done[把某事]弄清楚，查明 。例句：---Did you lock the door?
---I think so ,but I had better make sure.我最好还是确认一下。
b)to do something so that you can be certain of the result 设法确保
be sure of (doing )sth.:to be certain to get sth.or be certain that sth. will happen 一定会做某事；某事一定会发生。 例句：you can be sure of one thing --there will be a lot of laughs.有一点可以肯定--将会笑声不断。
be sure to do sth.[口语] used to tell sb.to remember to do sth.一定要做某事，务必要干某事【用于告诉某人记住做某事】
for sure [非正式] certainly or definitely 肯定的，确切的：例句：no one knows for sure what happend.没人确切的知道到底发生了什么事。