1 When the temperature drops below 0°C, water turns to ice.
2 If you like extreme sports, you will (love) ice climbing.
3 Unless he (trains), he won't be able to go ice climbing.
4 They always put on sunscreen when they (go) volcano surfing.
5 If you do (not have) a four-wheeled motorbike, you (can not go) quad
racing.
6 When iron gets wet, it (rusts).
Unless I try, I won't understand.
If the weather gets cold, we'll stay in.
If I study late in the evening, I feel tired the next day.
Unless my friends help me, I won't cope.
Snow melts when it is warmed.