My = můj, moje
Your = tvůj, tvoje
His = jeho
Her = její
Its = (jeho) toho

It is my coffee. = To je moje káva.
It is your coffee. = To je tvoje káva.
It is his coffee. = To je jeho káva.
It is her coffee. = To je její káva.
It is its coffee. = To je toho káva. (např. zvířete)