I am → I’m
We are → we’re
You are → you’re
He is → he’s
She is → she’s
It is → it’s (also, It has → it’s)
That is → that’s
They are → they’re
Can not → can't
Could not → couldn't
Will not → won't
Would not → wouldn't
May not → mayn't
Might not → mightn't
Must not → mustn't