Questions & Answers about Το υάλωμα καλύπτει τον πηλό.
Because Greek articles change according to gender, number, and case.
- υάλωμα is neuter singular, so its article here is το
- πηλός is masculine singular, and in this sentence it is the direct object, so it takes the accusative article τον
So the difference is not random: it reflects the grammar of each noun.
The subject is το υάλωμα and the object is τον πηλό.
A learner may expect word order alone to show this, as in English, but Greek also uses case forms:
- το υάλωμα is the thing doing the action
- τον πηλό is the thing receiving the action
So the sentence structure is:
- το υάλωμα = subject
- καλύπτει = verb
- τον πηλό = direct object