If it rains, the grass *(gets)* (verb)

When you mix red and blue, you *(get)* (verb)

If you heat ice, it *(melts)* (verb)

Water *(boils)* (verb) if you heat it to 100 degrees Celsius.

If you touch a fire, it *(burns)* (verb)

When the sun goes down, it *(gets)* (verb) dark.

If you cut onions, you often *(cry)* (verb)

When you press the button, the light *(turns)* (verb) on.

If dogs are happy, they usually *(wag)* (verb) their tails.

If plants don’t get water, they *(die)* (verb)

Metal *(expands)* (verb) when it heats up.

If you don’t eat, you *(feel)* (verb) hungry.

When cats are scared, they *(hiss)* (verb)

If you drop a ball, it *(bounces)* (verb)

When it snows, the ground *(becomes)* (verb) white.

Exercise 2: Zero Conditional

Plants *(grow)* (verb) if they have sunlight and water.

If you don’t sleep well, you *(feel)* (verb) tired in the morning.

When it’s cold outside, water *(freezes)* (verb)

If you mix acid and base, you *(obtain)* (verb) salt and water.

When you ring the bell, the dog *(comes)* (verb)

If you push something heavy, it *(moves)* (verb)

Babies *(cry)* (verb) when they are hungry.

When you call my name, I *(respond)* (verb)

Sugar *(dissolves)* (verb) if you put it in water.

If you cross an international date line, the date *(changes)* (verb)

When you are polite to others, they usually *(are)* (verb) polite back.

If it’s summer and you’re in Antarctica, the sun *(doesn’t)* (verb) set.

Snakes *(shed)* (verb) their skin as they grow.

If you stand in the rain, you *(get)* (verb) wet.

When you turn off the heat, the room *(cools)* (verb) down.