If I _________(meet) a bear, I _________(run) away.
If I met a bear, I would run away.
If people _________(produce) less rubbish, the planet ______(be) cleaner.
If people produced less rubbish, the planet would be cleaner.
If I ______(be) you, I _______ (go) to the skatepark every day.
If I were you, I would go to the skatepark every day.