1. Why haven't you finished last week's homework?
Because I was busy.
2. Why don't you like chocolate ice-cream?
Because I can't stand the taste.
3. Why didn't you watch the football match last night?
I was doing my homework.
4. Why can't you swim?
Because I'm afraid of water.
5. Why aren't you going to come back to school next year?
Because I'm moving to another city.