be sure to do sth 务必,一定做某事.常用于祈使句中. be sure of/about sth相信,对有把握,后接名词,代词或动名词.表示对某事的主观看法.
be sure that+从句 意为某人对有把握.
Be sure to finish your homework before six oclock.
Are you sure of the answer?
Im sure that he will come here.
-Can you gove me a hand, Tom? -_______.
A No, I dont B Sure C Yes D No, thanks
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