It can have several functions in Greek, similar to English words like "you," "your," or "yours" depending on the context.
Here are some examples:
* "Sou" as a possessive pronoun: It can mean "your" or "yours". For example, "To vivlio sou" means "Your book".
* "Sou" as a dative pronoun: It can indicate indirect object or possession, similar to "to you" or "for you". For example, "Agapω sou" means "I love you".
* "Sou" as a part of the verb "εχει" (echi): It can mean "you have" or "yours is". For example, "Echi sou ksekina?" means "Do you have a start?".
To understand the meaning of "sou" in a sentence, you need to consider the context and the grammar of the sentence.
If you give me a sentence with "sou" in it, I can help you understand its specific meaning.