The most useful drill may be one where the student is giving real information in their answers -in other words, there is communication as well as language practice:
TEACHER: STUDENTS: TEACHER: STUDENTS: TEACHER: STUDENTS:
What are you going to do after school? I'm going to play football.
And tonight?
I'm going to watch TV.
Are you going to watch the film?
No, I'm not. I'm going to watch the concert.