No. 4 in Serbian
су
The Serbian word "су" means "are" (third person plural of "to be").
In a sentence
Они су срећни.
They are happy.
Here, 'су' is used as a conjugation of the verb 'to be' (бити) in third-person plural, representing a state of being.
Књиге су на полици.
The books are on the shelf.
In this sentence, 'су' is again the auxiliary verb in third-person plural, indicating the presence or location of the books.
Идеје које су добре увек успевају.
Ideas that are good always succeed.
Here, 'су' serves as a linking verb in the relative clause to connect 'идеје' with 'добре' and describe their quality.
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