Moja sestra kaže da je to dobra vest.

to be

Breakdown of Moja sestra kaže da je to dobra vest.

• to: that
• dobar: good
• moj: my

Questions & Answers about Moja sestra kaže da je to dobra vest.

Why is it moja sestra and not moj sestra?

Because moja has to agree with sestra in gender, number, and case.

• sestra is feminine singular
• so the possessive moj changes to moja

This is the same kind of agreement you also see in dobra vest:

• dobra matches feminine singular vest

So Serbian is doing something English does not do much: words around the noun often change their form to match it.

What case is sestra here?

Sestra is in the nominative case because it is the subject of the sentence — the person doing the action of kaže.

So:

• moja sestra = the subject
• kaže = the verb

If sister had a different role in the sentence, it might appear in a different case.

What form is kaže?

Kaže is the 3rd person singular present form, meaning says.

It matches moja sestra, which is:

• 3rd person
• singular

So the logic is: