Be sure to come to my house.
Be sure to finish your homework as soon as possible.
2.be sure+從句,表“確信、對…….有把握”
I am sure he is coming.= He is sure to come.
3.make sure +從句 = make sure of 弄清、查清楚
Make sure that he has handed his workbook.
Make sure of it before you start out.