Ο προμηθευτής έστειλε τον λογαριασμό.

The electricity supplier sent the bill.

Breakdown of Ο προμηθευτής έστειλε τον λογαριασμό.

• στέλνω: to send
• ο λογαριασμός: the bill
• ο προμηθευτής: electricity supplier

Questions & Answers about Ο προμηθευτής έστειλε τον λογαριασμό.

Why are there two different forms of the: ο and τον?

Greek articles change form depending on the gender, number, and especially the case of the noun.

In this sentence:

• ο προμηθευτής = the supplier → subject of the sentence, so it is in the nominative
• τον λογαριασμό = the bill/invoice/account → direct object, so it is in the accusative

So:

• ο = masculine singular nominative the
• τον = masculine singular accusative the

This is one of the first big differences from English, where the never changes form.

How do I know which word is the subject and which is the object?

The forms of the article and noun tell you.

• ο προμηθευτής is nominative, so it is the subject
• τον λογαριασμό is accusative, so it is the direct object

So the sentence structure is:

• Ο προμηθευτής = the supplier
• έστειλε = sent
• τον λογαριασμό = the bill/invoice

Even if the word order changed, the case endings would still help you identify who did the action and what received the action.

What tense is έστειλε?