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Hi again.  When a preposition ends in τα, του, της- does the next word that follows need to be in agreement as in  gen. plural nuet, male sing. gen, and fem. sing. gen. Such as εξτός από τα except for,  αντί του instead of, and εξ ονόματος της on behalf of?  Or change τα, του, της to match the next word?  Thank you
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Prepositions are indeclinable parts of speech, which means that they never change form. (εκτός, αντί, εξ etc -> prepositions. They never change.) According to the rules of syntax, prepositions are followed by a noun (or an adjective and a noun) or a pronoun either in accusative or in genitive case. (The case depends on the preposition and its meaning).

So, the words τα, του, της etc are articles, and they are always in agreement with the following noun or adjective. The agreement exists between the article and the noun, not the article and the preposition. Each preposition, though, can be combined either with accusative or with genitive case.


εκτός από τον Γιώργο. -> "από" is a preposition which must be followed by accusative case. "Τον Γιώργο" is accusative. (the article "τον" is in agreement with the noun "Γιώργο")

εξ ονόματος  -> "εξ" is an ancient Greek preposition and it should be followed by genitive case, according to the syntactic rules. "ονόματος" is genitive case of the noun "όνομα". In this phrase there is not an article before the noun, but if there were, it would be in genitive (του)

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Thank you.  The list of prepositions I have, some have articles attached.  I thought they were part of the preposition itself.    In στο μέτρο του- as far as- the του will change gen. fem. if the noun or adj. that follow is.

The prepositions in modern Greek are the following:
με, σε, για, ως, πριν, προς, σαν, αντί, από, δίχως, έως, κατά, μετά, μέχρι, παρά, χωρίς, εναντίον, εξαιτίας, ίσαμε, μεταξύ

And some prepositions from ancient Greek, used in catchphrases and literary expressions:
ανά, άνευ, αμφί, διά, εις, εκ (εξ), εκτός, εν, ένεκα, εντός, επί, λόγω, περί, πλην, προ, συν, υπέρ, υπό, χάριν (χάρη).

 "στο μέτρο του" is not a preposition, but the article του can change into της if the following noun is feminine, into των if the following noun is in plural, etc. The rule is the same.