Suggestions and offering

a:Gmorning, brother?

b : Morning, what’s up bro?

a : Fine, how about you ?

b : Ok, fine to thank you.

a : What are you doing?

b : I was clean the blackboard.

a : Can I clean the blackboard for you?

b : Thank you, I appreciate your help

a : Yes, it a pleasure.

b : How about going to the canteen after clean the blackboard?

a : Ok, it is a good idea. see you then

b : see you then.