Что это? Кто это?
Ask кто это? when you talk about animate objects (that denotes persons or animals)
Ask что это? when you talk about inanimate objects (that denotes objects)
Notes:
1) Read more about the difference between animate and inanimate objects here - https://www.ruspeach.com/learning/2155/
2) мой, моя - are posessive pronouns, they change their endings because of the gender of the noun they go with. (read more about it here - https://www.ruspeach.com/learning/3371/)
Кто это?
[kto èhta]
- C`est qui?
Это моя мама.
[èhta maja màma]
- C`est ma mère.
Это мой папа.
[èhta moj pàpa]
- C`est mon père.
Ask что это? when you talk about inanimate objects (that denotes objects)
Что это?
[shto èhta]
- C`est quoi?
Это мой стул.
[èhta moj stùl]
- C`est ma chaise.
Это моя книга.
[èhta mayà knìga]
- C`est mon livre.
Notes:
1) Read more about the difference between animate and inanimate objects here - https://www.ruspeach.com/learning/2155/
2) мой, моя - are posessive pronouns, they change their endings because of the gender of the noun they go with. (read more about it here - https://www.ruspeach.com/learning/3371/)