5.4 GRAMMAR First Conditional with if and ur First Conditional with if and unless You won't know if you don't try! You won't know unless you try! Time clauses with when follow a similar pattern. When I'm back home, I'll watch some slacklining videos. 1. Choose the correct option. 1 You enjoy / You'll enjoy gymnastics if you try/ you'll try it. 2 If you have / you'll have some skiing lessons, you be / you'll be a very good skier. 3 We don't go / won't go for a walk unless the weather is / will be good. 4 You get / You'll get fitter if you join / you'll join a gym. 5 You don't improve / won't improve unless you practise / you'll practise. Complete the sentences with if or unless. We'll go to the match unless the tickets are too expensive. 4