Ответ:
Ex.4
1) When I phoned my friends, they were playing monopoly.
2) The kids were playing in the garden when it suddenly began to rain.
3) I was practising the guitar when he came home.
Ex.5
1) Next month my friend and I will travel together around Europe.
2)The athletes soon will return from the competition.
3) Her parents think Alice will become a teacher one day.
4) They have bought new sports shoes. They are going to start running next week.
5) I am going to meet the editor at 10 o`clock tomorrow.