英文問題English questions

Hmm.. I think they are all wrong.

Case 1: if you know the person bought it already, then is ;
I know you bought the basketball for me.

Case 2: if you know the person is going to buy one for you then is ;
I know you are going to buy a basketball for me.

I know you will buy me a basketball.

I know you buy the basketball to me.
第一句係岩既。