Use
The Zero Conditional
To describe facts.
The Zero conditional
If clause: simple present
Main clause: simple present
Zero conditional example
If I am thirsty, I drink water.
If it is pay day, she does the grocery shopping.
She does the grocery shopping if it is pay day.
Simple present conjugation of verb be
you,we, they : are
I: am
he, she, it: is
The 1st conditional
To describe cause and effect.
The 1st conditional
If clause: simple present
Main cluse: future will
1st conditional example
If he is late, she will be angry.
They will sing if there is a raffle.
Simple present conjugation of other verbs.
I, you, we, they: base form
he, she , it : base form + s
The 2nd conditional
To describe unreal situations.
The 2nd conditional
If clause: simple past
Main clause: would + base form
2nd conditional example
If I had some extra money, I would buy a new car.
If I were you, I would learn as many verbs as I could.
I would learn as many verbs as I could if I were you.
simple past negative auxiliary verb
did , didn't