He wouldn't be so tired, if he go to bed earlier. (go) b/ If you do sport, you will be fit. (be) c/ If he don't cry at everybody, he would have more friends. (not cry) d/ We won't pass our exams, if we don't study a lot . (not study )
a / if I was older (e), I would go to Britain. b / If you read a lot, you'll be good (not) in French. c / If you do not smoke, you feel better.