If I’d seen Poppy, I wouldn’t have fallen over. If you'd remembered the map, we wouldn’t have got lost. If I'd known it was your birthday, I would've bought you a present. If they hadn't won the match, the manager would've lost his job. If the train hadn't stopped in time, there would've been a serious accident. If you hadn't been so lazy, you wouldn't have failed the exam. 'If' clause past perfect Main clause would have + past participle https://339efcb25eb75e967b0d-ff8eeadd950d51fd1fc939dca75b3973.ssl.cf1.rackcdn.com/assets_green.swf