If you stick a pin into a balloon, it bursts.
We use if sentences to talk about results that will certainly happen. In these sentences, both verbs are in the present simple tense.
Mum’s advice:
If you go to bed earlier, If you telephone your friends, If you check your timetable every
night, If you look it up in the dictionary, If you think about each picture for
Unless you leave now, you will be late for school. If you don’t leave now,
C1 Join the following sentences with if ... not. 1 you improve your handwriting/you will lose marks in the exam
2 Metal ___________________________________________ it. (you/heat/melts/if)
3 Wood ________________________________________ water. (you/into/put/if/floats/it)
If I invent a kind of special brain food, everybody will buy it.