Make questions and answers with HOW LONG? and the present perfect continuous. example 1: you/try/ to phone me? (half an hour)
A: How long have you been trying to phone me?
B: i've been trying to phone you for half an hour.
2: the chicken/cook/in the oven? (about twenty minutes)
3: Carl Schmidt/play football/ for Brazil? (start of the season) Pleaseee