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.
be sure 是已经确定了的事情,如：I'm sure that you are wrong .
make sure 是待确定的事物,如：To make sure the answer is right
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