I am …ing, What are you ... ing (now/at the moment)
Analysis: Assume the learners know the verb 'to be'. The structure is therefore simple, but there are a limited number of 'real' situations, i.e. limited to 'now', in which this structure can be practised. So make sure you choose some practice situations, e.g. A role play telephone conversation, a large picture with people doing things, an imagination game e.g. looking out of the window, a miming game, a memory game. Some are controlled and some of these are freer.
Lead in
Elicit some actions using mime, or pictures or questions
Put some up on the board
Presentation
Elicit the structure (not forgetting the question form), and model and drill it,
Get the students to use examples you have on the board to drill further. Write some examples on the board to highlight the form. Underlining the auxiliary verb and the ‘ing’
Controlled practice
In open pairs do a mime or hold up a picture of an activity and get students to ask What is he doing? And another student gives the response.
Correct where necessary. Don’t forget give students a chance to self-correct/peer correct first.
Free practice
Set up a freer practice activity, perhaps some closed pair work. There are some ideas above or use your own. Why not try a conversation in pairs, students pretend they are on holiday and they have to describe to their friend what everyone else is doing right now.
Monitor and feedback.