They ... (not go) to the gym if they ... (be) tired., They don't go to the gym if they are tired., When I ... (make) salads, I ... (use) only olive oil., When I make salads, I use only olive oil., If she ... (eat) healthy food, she ... (feel) better., If she eats healthy food, she feels better., We ... (not use) calculators when we ... (write) tests., We don’t use calculators when we have tests., If Ben ... (know) English, he ... (can) understand him., If Ben knows English, he can understand him., When the sun ... (go) down, it ... (get) dark., When the sun goes down, it gets dark., I ... (be) happy if I ... (be) at home., I an happy if I am at home., If you ... (mix) blue and red, you ... (get) purple., If you mix blue and red, you get purple., If a student ... (not learn), he or she ... (get) a bad grade in a test., If a student doesn't learn, he or she gets a bad grade in a test., My mum ... (not sleep) if she ... (drink) coffee before bed., My mum doesn't sleep if she drinks coffee before bed..

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