1) If you heat ice, it melts  a) zero conditional (if+ present simple + present simple) b) first conditional (if + present simple + future (will) 2) If it rains tomorrow, we will stay at home.  a) zero conditional (if+ present simple + present simple) b) first conditional (if + present simple + future (will) 3) If you press this button, the machine turns on. a) first conditional (if + present simple + future (will) b) zero conditional (if+ present simple + present simple) 4) If he doesn't wear a jacket, he will get cold.  a) zero conditional (if+ present simple + present simple) b) first conditional (if + present simple + future (will)

Zero or First Conditional

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