Ο οπαδός κάθεται στην κερκίδα και πίνει νερό.

Ο is the definite article for a masculine singular noun in the nominative case. It means the.

So:

• ο οπαδός = the fan / the supporter

Greek uses articles very often, and they change form depending on gender, number, and case.

Also, the article is capitalized here only because it is the first word of the sentence. Normally it would be ο.

οπαδός is in the nominative singular, because it is the subject of the sentence — the person doing the actions.

You can tell from:

• the article ο
• the basic dictionary-like form of the noun
• the fact that it matches the verbs κάθεται and πίνει

So the structure is:

• Ο οπαδός = the subject
• κάθεται = sits / is sitting
• πίνει = drinks / is drinking

Οπαδός means supporter, fan, follower. It is very commonly used for a sports fan, especially in contexts like a stadium, team, or match.

Because this sentence includes κερκίδα (the stands), the meaning is very naturally sports fan / supporter here.

In other contexts, οπαδός can also mean a follower of an idea, movement, or person.

Κάθομαι is the dictionary form of the verb, meaning to sit / to be seated.

Κάθεται is the 3rd person singular present tense form, meaning:

• he sits
• she sits
• it sits
• or, in natural English, he/she is sitting

So:

• κάθομαι = I sit / I am sitting
• κάθεται = he/she sits / is sitting

This is a very common pattern in Greek: you learn the verb in one form, but in a sentence it changes according to the subject.

That is a very common learner question.

The verb κάθομαι belongs to a group of Modern Greek verbs that use middle/passive-type endings but have an active meaning.

So even though κάθεται ends like a passive-style form, it does not mean is being sat. It simply means sits / is sitting.

This is normal Greek usage, and it is something learners just get used to over time.

Both are in the present tense.

In Greek, the present tense can often correspond to either:

• the simple present in English: sits, drinks
• or the present continuous: is sitting, is drinking

So this sentence could be understood as:

• The fan sits in the stands and drinks water
• or more naturally in many contexts, The fan is sitting in the stands and drinking water

Greek does not always separate those two ideas the way English does.

Στην is a contraction of:

• σε = in, at, to, on
• την = the (feminine accusative singular)

So:

• σε την → στην

This contraction is extremely common in everyday Greek.

Here:

• στην κερκίδα = in the stands / in the stand

Depending on context, σε can mean in, at, on, or to.

Κερκίδα is a feminine singular noun, and here it is in the accusative singular because it follows σε / στην.

In Modern Greek, σε normally takes the accusative case, even when it expresses location.

So:

• nominative: η κερκίδα
• accusative: την κερκίδα
• after contraction: στην κερκίδα

This is one of the important differences from English: location after a preposition still often uses the accusative in Modern Greek.

Κερκίδα means the stands, bleachers, or a seating section in a stadium or arena.

In sports contexts, it refers to where the spectators sit.

So in this sentence, it helps confirm that οπαδός is a supporter/fan at a sporting event.

Greek often leaves out the article with mass nouns or when speaking in a more general/indefinite way.

So:

• πίνει νερό = drinks water
• πίνει το νερό = drinks the water

The version without the article sounds natural if you just mean that the person is drinking some water, not a specific previously mentioned water.

This is similar to English, where we also usually say drinks water, not drinks the water, unless we mean a specific water.

Because Greek is a pro-drop language, which means the subject pronoun is often omitted when the verb form already shows who the subject is.

The verb endings tell you the person and number:

• κάθεται = he/she sits or is sitting
• πίνει = he/she drinks or is drinking

Since ο οπαδός is already stated, Greek does not need an extra he.

Adding a pronoun like αυτός would usually add emphasis, not just basic information.

Yes, very much so.

Και joins the two verbs:

• κάθεται and πίνει

Since the subject ο οπαδός is already given, Greek does not need to repeat it.

So the structure is:

• Ο οπαδός κάθεται στην κερκίδα και πίνει νερό.

This is perfectly natural Greek, just like English The fan is sitting in the stands and drinking water.

Greek word order is more flexible than English word order, because case endings and verb forms give a lot of grammatical information.

The sentence as written is a neutral, natural order:

• Ο οπαδός κάθεται στην κερκίδα και πίνει νερό.

But other word orders are possible for emphasis, for example putting emphasis on location or on what he is drinking.

Even so, the version you were given is the most straightforward and normal one for a learner to start with.

A rough pronunciation guide:

• οπαδός → o-pa-THOS
  The δ in Modern Greek sounds like th in this.

• κάθεται → KA-the-te
  The θ sounds like th in thin.

• κερκίδα → ker-KEE-tha

• πίνει → PEE-ni

• νερό → ne-RO

The accent mark in Greek shows which syllable is stressed, so it is worth paying close attention to it.