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be sure指某人对某事或对某种情况有把握，常译为：“确信”；make sure指“务必、务请、确保”将某事弄清楚。如：二者后面均可接of或about引出的短语。I am sure of success= I am sure that I will succeed.我深信会成功。make sure后面的that从句一般不用或很少用将来时；be sure后面的that从句则可用将来时。
拓展
sure的习惯搭配
be sure to do sth
一定要，务必（去做某事）
Be sure to give your family my regards.
务必代我向你的家人问好。
for sure
(informal) 无疑；肯定
No one knows for sure what happened.
谁也不知道究竟发生了什么事。
sure of yourself
(sometimes disapproving) 自信；自以为是
She seems very sure of herself.
她好像十分自信。
sure thing
（答应建议或要求）当然，一定
‘Are you coming?’ ‘Sure thing.’
“你来吗？”“当然。”
to be sure
（承认属实）诚然，固然，无可否认
He is intelligent, to be sure, but he's also very lazy.
他固然聪明，但也很懒。
make sure (of sth/that…)
1-确保；设法保证
Make sure (that) no one finds out about this.
绝对不要让任何人发觉这件事。
They scored another goal and made sure of victory.
他们又进了一个球，这就赢定了。
Our staff will do their best to make sure you enjoy your visit.
我们的人员会竭尽全力使您访问愉快。
2-查明，核实，弄清（某事属实或已做）
She looked around to make sure that she was alone.
她往四下里看看，是不是只有她一个人。
I think the door's locked, but I'll just go and make sure.
我觉得门已经锁上了，不过我还是去看看好放心。
(as) sure as eggs is eggs
千真万确；的的确确
sure enough
（表示不出所料）果真，果然
I said he'd forget, and sure enough he did.
我说他会忘记，他果然就忘了。