Zero Conditional If we ... (to sing) very loudly, neighbours are not happy. If (to be) vory tired, always yawn. If he (to stop) breathing, he starts choking. If a car is out of fuel, it . (to stop) beside the road. If a plane .. (to be) out of fuel, it falls. he .. .. (not / to swim) anymore, he sinks in deep waters. If she .. (to breathe), she lives.
If we sing very loudly, neighbours are not happy. If I am very* tired, I always yawn. If he stops breathing, he starts choking. If a car is out of fuel, it stops beside the road. If a plane is out of fuel, it falls. If he doesn't swim anymore, he sinks in deep waters. If she breathes, she lives.