"To jest moją matką."
Never say this to anyone!
In this sentence you expresses great disapproval to the person who's your mother. Actually, you're saying that she's not even a woman but a 'to' ('it')...
You should say:
- "To jest moja matka" when pointing or introducing
or
- "Ta pani/kobieta jest moją matką" when describing the person.
Beware! Omitting 2 small ogonki (a-ą) makes a HUGE difference in the meaning of this sentence.
Cinek