Răspuns :

Răspuns:

While Alex and Sue were watching a film on DVD, their friends arrived.

Alex and Sue were watching a film on DVD when their friends arrived.

While Marco was having breakfast, he had a great idea.

Marco was having breakfast when he had a great idea.

While Cristina was talking o the phone, her father went out.

Cristina was talking on the phone when her father went out.

While they were walking in the mountains, they saw a strange a bird.

They were walking in the mountains when they saw a strange bird.