Ο συμπρωταγωνιστής αυτοσχεδιάζει στα παρασκήνια.

The co-star improvises backstage.

Breakdown of Ο συμπρωταγωνιστής αυτοσχεδιάζει στα παρασκήνια.

• τα παρασκήνια: the backstage area
• ο συμπρωταγωνιστής: the co-star
• αυτοσχεδιάζω: to improvise

Questions & Answers about Ο συμπρωταγωνιστής αυτοσχεδιάζει στα παρασκήνια.

What part of speech is each word in Ο συμπρωταγωνιστής αυτοσχεδιάζει στα παρασκήνια?

• Ο = the masculine singular definite article, the
• συμπρωταγωνιστής = a masculine noun, co-star / supporting lead / fellow protagonist, depending on context
• αυτοσχεδιάζει = verb, improvises / is improvising
• στα = contraction of σε + τα, usually meaning in / at / to the
• παρασκήνια = neuter plural noun, backstage / the backstage area

So grammatically, the sentence is:

• subject: Ο συμπρωταγωνιστής
• verb: αυτοσχεδιάζει
• prepositional phrase: στα παρασκήνια

Why does the sentence begin with Ο?

Ο is the masculine singular definite article, meaning the.

It is used because συμπρωταγωνιστής is:

• masculine
• singular
• in the nominative case here, because it is the subject of the sentence

So:

• ο συμπρωταγωνιστής = the co-star

This is the basic nominative singular article for masculine nouns.

What exactly does mean?