Первый ответ сделаю лучшим сделайте условные предложения нулевого типа. 1. if/you/send/an e - mail/ it/be /free. 2. it/dangerous/you/not/wear/a seatbelt 3. if/ you/ have/ an injection/ it/not/ usually/ hurt 4. if you/not/water/plants and flowers/they die 5. if the sea/not/be/calm/not/ be/safe/to swim.
1 If you send an e-mail, it is free.
2 It is dangerous if you don't wear a seatbelt.
3 If you have an injection, it doesn’t usually hurt.
4 If you don't water plants and flowers,they die.
5 If the sea isn’t calm, it isn't safe to swim.