Can, can’t and Have to

 I learned that we use can for possibilities and can’t un negative.

Example: 

A: what do you think about play soccer tomorrow ?

B: I can’t, I have to study all day 

That was an example in negative 

And with have to I learned that we use it when we say something that is necessary or required an example of this is:

A: do yo want to hang out this Friday?

B: this Friday is impossible for me, I have to work

That was what I learned, I’m liking this class and I’m learning a lot.