If sea levels _____ as expected, countries below sea level will be flooded.

If people _____ drive to work, they would save a lot of petrol.

What _____ our city be like if everybody used public transport?

If the rain forest continues to be destroyed at the current rate, it _____ in forty years’ time.

If the factory _____ tons of toxic waste into the river, hundreds of fish wouldnʼt have died.

If you turn off the tap while brushing your teeth, you _____ a lot of water.

If I _____ the president of Brazil, I would stop illegal logging.

If she _____ so fast, she wouldnʼt have had the accident.

If illegal logging companies were stopped, fewer forests _____ destroyed.

If I had written down her phone number, I _____ able to call her last night.

If we _____ cars less frequently, we would reduce CO2 emissions from traffic jams.

If we enforce the Kyoto Protocol, we _____ greenhouse effect emissions.

If there _____ so many cars, we wouldnʼt need such wide roads.

My parents wouldnʼt have punished me if I _____ my homework.

If you wear sandals in the mountains, you _____ on the rocks.

If the activists hadnʼt campaigned against the ring road, the government _____ it.

If Rita _____ doing her homework, the teacher will give her a low mark.

If Tim and Tom were older, they _____ in our hockey team.

If Michael _____ more pocket money, he would ask Doris out for dinner.