present
I warn
You warn
He warns
She warns
It warns
We warn
They warn
past
I warned
You warned
He warned
She warned
It warned
We warned
They warned
future
I will warn
You will warn
He will warn
She will warn
It will warn
We will warn
They will warn
conditional
I would warn
You would warn
He would warn
She would warn
It would warn
We would warn
They would warn