1. I can speak English fluently because I have enough practice.
2. I can't fly because I am afraid of heights.
3. I can ride a bike because I was taught long ago.
4. I can swim because I was taught when I was young.
5. I can't cook because I don't like doing this.
6. I can't buy a house because I already have one.
7. I can travel alone because I am old enough.
8. I can paint because it's my hobby.