zero cond.
first cond.
100

When an octopus lays its eggs, 

it protects them until they hatch.

100

What will happen if it rains tomorrow?

If it rains tomorrow, I will stay at home.

200

If people eat too much sugar, what happens to their teeth?

If people eat too much sugar, their teeth get damaged.

200

If you study hard, what will you achieve?

If I study hard, I will pass the exam.

300

What do you usually do if you feel tired?

If I feel tired, I take a rest

.

300

What will happen if you touch fire?

If you touch fire, you will burn your hand.

400

If the sun sets, what happens to the sky?

If the sun sets, the sky becomes dark.

400

What will happen if you drop a glass?

If I drop a glass, it will break.

500

What happens if you mix yellow and blue?

If you mix yellow and blue, you get green.

500

What will happen if you don’t sleep at night?

If I don’t sleep at night, I will be tired.