Take some ice. Put it in a saucepan. Heat the saucepan. What happens? The ice melts (it becomes water). You would be surprised if it did not.
|present simple||present simple|
|If||you heat ice||it melts.|
NOTE:We can also use when instead of if, for example: When I get up late I miss my bus.
If I miss the 8 o'clock bus, I am late for work.
If I am late for work, my boss gets angry.
If people don't eat, they get hungry.
I am late for work if I miss the 8 o'clock bus.
My boss gets angry if I am late for work.
People get hungry if they don't eat.