Η υπηρεσία αποκομιδής έρχεται αύριο για το ογκώδες έπιπλο.

Because it is in the genitive singular and depends on υπηρεσία.

So η υπηρεσία αποκομιδής literally means something like:

• the service of collection/removal

This is a very common Greek pattern: a noun followed by another noun in the genitive to show what kind of thing it is.

Examples of the same structure:

• η στάση λεωφορείου = the bus stop
• το κέντρο υγείας = the health center
• η υπηρεσία καθαριότητας = the cleaning/sanitation service

So here αποκομιδής is not the subject by itself; it is describing what kind of service it is.

It is a noun phrase meaning the collection/removal service.

In context, it usually refers to a municipal or official service that comes to remove something, especially waste, rubbish, or bulky items.

Word by word:

• η υπηρεσία = the service
• αποκομιδής = of collection / of removal

So the full phrase is basically the pickup service or the collection service.

Η is the feminine singular definite article, meaning the.

It is used because υπηρεσία is:

• feminine
• singular
• nominative here, because it is the subject of the sentence

So:

• η υπηρεσία = the service

Greek articles change according to gender, number, and case, unlike English the, which never changes.

Because Greek often uses the present tense for a scheduled or arranged future event, especially when there is a time word like αύριο.

So έρχεται αύριο literally looks like comes tomorrow, but it naturally means:

• is coming tomorrow
• will come tomorrow

This is very similar to English:

• The service is coming tomorrow.
• My train leaves tomorrow.

So the Greek present tense here does not mean it is happening now. The word αύριο clearly places it in the future.

Yes. A Greek speaker could also say something like:

• Η υπηρεσία αποκομιδής θα έρθει αύριο...

That would also mean The collection service will come tomorrow...

The difference is mostly in style and nuance:

• έρχεται αύριο sounds very natural for something scheduled or arranged
• θα έρθει αύριο is a more explicit future

Both are correct. In everyday speech, the present tense for scheduled events is extremely common.

Here για means something like:

• for
• regarding
• to deal with
• to pick up

In this sentence, για το ογκώδες έπιπλο means the service is coming for the bulky piece of furniture, in the sense that this is the item they are coming to collect.

So it is not just a vague for; it has the practical meaning of:

• to take care of
• to collect
• for the purpose of removing

Because έπιπλο is:

• neuter
• singular

So its article is το.

The adjective ογκώδες agrees with έπιπλο in gender, number, and case, so it also appears in the neuter singular form.

So:

• το = the (neuter singular)
• ογκώδες = bulky
• έπιπλο = piece of furniture / furniture item

Together:

• το ογκώδες έπιπλο = the bulky piece of furniture

Because ογκώδης / ογκώδες is an adjective pattern where the neuter singular nominative/accusative form ends in -ες.

This adjective has forms like:

• masculine/feminine: ογκώδης
• neuter: ογκώδες

Since έπιπλο is neuter, Greek uses the neuter form:

• ογκώδες έπιπλο

This type of adjective may look unusual at first because it does not follow the very common -ος, -η, -ο pattern.

It is in the accusative singular.

That is because it follows the preposition για, which normally takes the accusative.

So:

• για το ογκώδες έπιπλο = for the bulky piece of furniture

With neuter nouns like έπιπλο, the nominative and accusative forms are often the same in appearance, so you identify the case by its role in the sentence and by the preposition.

In Greek, έπιπλο is usually a piece of furniture or an item of furniture.

So:

• το έπιπλο = the piece of furniture
• τα έπιπλα = the furniture / the pieces of furniture

This is slightly different from English, where furniture is usually uncountable. Greek often treats it as a countable noun.

So in this sentence, το ογκώδες έπιπλο is best understood as:

• the bulky item of furniture
• the bulky piece of furniture

Greek word order is more flexible than English word order.

Both of these are possible:

• έρχεται αύριο
• αύριο έρχεται

The difference is usually one of focus or emphasis, not basic meaning.

• έρχεται αύριο sounds neutral: it’s coming tomorrow
• αύριο έρχεται puts more attention on tomorrow

In your sentence, the order is very natural and neutral.

Yes, it is a normal formal-to-neutral word meaning:

• bulky
• voluminous
• cumbersome because of size

For a furniture pickup context, it is very appropriate, because municipalities and services often talk about ογκώδη αντικείμενα or ογκώδη απορρίμματα, meaning:

• bulky items
• bulky waste

So ογκώδες έπιπλο sounds quite natural in an official or practical context.

The subject is Η υπηρεσία αποκομιδής.

You can tell because:

• it is in the nominative
• the verb έρχεται is third person singular
• the phrase means the thing that is doing the action

So the structure is:

• Η υπηρεσία αποκομιδής = subject
• έρχεται = verb
• αύριο = time expression
• για το ογκώδες έπιπλο = prepositional phrase explaining what the visit is for

It sounds natural, but slightly on the official/practical side because of words like:

• υπηρεσία
• αποκομιδής
• ογκώδες

This is the kind of wording you might see in:

• a message from a municipality
• a customer-service note
• an apartment-building conversation
• a pickup appointment

A more casual speaker might simplify it, but the sentence itself is perfectly natural and correct.