make sure后可加That引导从句；
make sure of后面只能加短语或词组。
be sure和 make sure的区别
1．be sure＋of／about+动名词或名词；
2．be sure+不定式,3．be sure+宾语从句
make sure表示“弄确实；核实；查证”.
make sure常用于祈使句,后面常接that宾语从句或of介词短语.
make sure是指弄清楚
be sure是指对...有把握
be sure表达肯定的意思，如I am sure he is good at english, 说我确定他英语很行
make sure表达的意思则是不确定，而需要弄清楚，如make sure his Englsih is good.去弄清楚他的英语是不是真的很行。
be sure
确信,肯定
接be sure of(about)/ to do/that
I can't be sure.
make sure that/of 查明; 设法确保, 确定
You must make sure of the time and place.
Make sure at least two people can attend.。
参考资料
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