Ответ:
1. We had to stop the football match yesterday because of bad weather.
2. You don't have to wear a helmet, but it's always a good idea.
3. We didn't have to wear wetsuits because the water wasn't cold.
4. Eric has to practise every day before a big competition.
5. When we play sport at school we have to wear a red T-shirt.
6. Lara doesn't have to wear goggles, but she prefers to.