This and that: този, тази, това, тези

Demonstratives agree with the noun in gender and number, just like adjectives.

• this/these: този (m), тази (f), това (n), тези (pl)
• that/those: онзи (m), онази (f), онова (n), онези (pl)
• such, like that: такъв (m), такава (f), такова (n), такива (pl)

Always check the noun's grammatical gender, not its meaning: тази нощ (нощ is feminine), това кафе (кафе is neuter), онова момче (момче is neuter), тези деца (plural). Това on its own also means 'this' or 'it': Това е моята къща (This is my house).