1 If we plant more trees, the air will be fresher.
2 If we use fewer cars, we will reduce pollution.
3 If we cycle to school every day, we will keep fitter.
4 If we use recycled products, we will save money.
5 If people throw rubbish into the right bin, they will keep the environment clean.
6 If we turn off the tap when brushing the teeth, we will save a lot of water.
7 If people travel more by public transport, the hamrful gases in big cities will be reduced.
8 If we didn't start at six, we wouldn't arrive there before noon.
9 If the boy eats so may green apples, he will be ill.
10 If we use reusable bags for shopping, we will reduce waste.
