LANGUAGE FOCUS - be going to: questions - Present continuous for future arrangements

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Son: You sound happy, Mum. Why are you singing?

Mum: I ¹  very happy.

Son: That's nice. ²  anything on Saturday?

Mum: Yes! You ³  for your exams, remember? Why ⁴  you ?

Son: Because Rob's ⁵  to a concert on Saturday and he invited me. Is that OK? Mum? You're very quiet.

Mum: Mmm. I ⁶ . 

Son: Oh no-don't think! Just say yes ... please!