1. If Nick hadn't climbed the ladder, he wouldn't have broken his leg.
2. If Mr Davidson had been driving carefully, he would have avoided the accident.
3. If John Smithson had been running faster, he would have won the race.
4. If Chris hadn't been playing with a knife, he wouldn't have cut his finger.
5. If Mary has got a headache, she should take an aspirin.
6. If Mrs Claydon hadn't left fish on the tablet, the cat wouldn't have eaten it.