Flexible Word Order & Emphasis
Because case endings already mark who does what, Greek word order is FREER than English. The neutral order is Subject–Verb–Object (Ο δάσκαλος αγαπά τη μητέρα), but you can move a word to the FRONT to emphasise it - Τη μητέρα αγαπά ο δάσκαλος (“It’s the mother the teacher loves”) - without confusion, because τη μητέρα stays marked accusative (the object) wherever it sits. Word order in Greek carries emphasis, not grammatical role.
The rule
Because case endings already mark the subject (nominative) and object (accusative), Greek can move words around for emphasis without changing who-does-what. Ο δάσκαλος αγαπά τη μητέρα and Τη μητέρα αγαπά ο δάσκαλος mean the same thing - “the teacher loves the mother” - but the second fronts τη μητέρα to stress it. Read the endings, not the order: the nominative is the subject wherever it sits.