New grammar: MODALS
There are many, but here's the one's we're going to do:
1. Can/ to be able to
2. Could
3. Must/ have to/ should
First: can/ to be able to
Can = possibility, ability and request.
Can I go to the bathroom?
Can I run at 50 mph?
You can go home after classes.
to be able to = only ability
He is able to chug a whole bottle of coca-cola.