I am not sure whether it is your birthday today的中文

I am not sure的用法有几种 I am not sure( )he will come or not i am not sure _____ he will com. I am not sure if he to the party This is the last thing I am not sure about. 11. I want to give a birthday party, but I am not sure _____. I am not sure whether two days___enough fot them to finish the work. I am not sure if it will be fine or cloudy?正确吗？ I am not sure what the play is about, but they will be singing Beetle songs. I am sure I do!是什么意思