Look around the classroom. Speculate about your classmates.
A: I think tom must be playing tennis later. He has his tennis racket with him today.
B: and Carmen might be happy about something. She's smiling a lot.
Class activity..... Were your speculations correct? Ask your classmates.
A: Tom, I see you have your tennis racket. Are you playing tennis later?
B: actually, no. I played before class.