Η τραπεζική προμήθεια είναι μικρή.

A natural pronunciation is roughly:

ee trapezikí promíthia íne mikrí

A few notes:

• Η sounds like ee
• τραπεζική has the stress on the last -κή
• προμήθεια has the stress on μή
• είναι is usually pronounced íne
• μικρή has the stress on the last syllable

The accents show you where the stress goes.

Η is the feminine singular definite article, so here it means the.

It is used because προμήθεια is a feminine singular noun. So:

• η προμήθεια = the fee / the commission

Even though the letter Η is written with the capital form of eta, in Modern Greek it is pronounced ee, not like an English h.

Because τραπεζική is an adjective agreeing with προμήθεια.

The noun προμήθεια is:

• feminine
• singular
• nominative

So the adjective must match it:

• masculine: τραπεζικός
• feminine: τραπεζική
• neuter: τραπεζικό

Here:

• τραπεζική προμήθεια = bank fee or more literally banking fee

For the same reason: it agrees with προμήθεια.

Since προμήθεια is feminine singular, the predicate adjective must also be feminine singular:

• masculine: μικρός
• feminine: μικρή
• neuter: μικρό

So:

• Η προμήθεια είναι μικρή = The fee is small

προμήθεια is the subject of the sentence.

Its form here is:

• nominative
• singular
• feminine

The full noun phrase is Η τραπεζική προμήθεια.

Then είναι μικρή tells us something about that subject:

• είναι = is
• μικρή = small

So the structure is:

subject + verb + predicate adjective

Yes, in this context that is the natural meaning.

More literally:

• τραπεζική = banking / bank-related
• προμήθεια = fee / commission

So τραπεζική προμήθεια can mean:

• bank fee
• bank commission
• banking charge

The exact English translation depends on context, but grammatically it is simply an adjective plus a noun.

In a normal sentence like this, Greek usually does use είναι.

So:

• Η τραπεζική προμήθεια είναι μικρή = normal full sentence

If you removed είναι, it would not sound like a standard complete sentence in ordinary prose. Greek can omit verbs in some special contexts, such as headlines, notes, or very informal speech, but for a basic statement like this, είναι is expected.

Yes, Greek word order is more flexible than English.

The most neutral order here is:

• Η τραπεζική προμήθεια είναι μικρή

But you might also see:

• Μικρή είναι η τραπεζική προμήθεια
• Η προμήθεια είναι μικρή
• Η προμήθεια η τραπεζική είναι μικρή is not the normal way to say this

Changing the order usually changes the emphasis, not the basic meaning.

For example:

• Μικρή είναι η τραπεζική προμήθεια emphasizes small

τράπεζα is the noun bank.

τραπεζική is an adjective built from that idea, meaning:

• banking
• bank-related

So:

• τράπεζα = bank
• τραπεζική προμήθεια = bank fee
• τραπεζικός λογαριασμός = bank account
• τραπεζική κάρτα = bank card

English often uses a noun before another noun, like bank fee, but Greek commonly uses an adjective instead.

Here small is the best choice.

When talking about fees, prices, costs, charges, and amounts, μικρός / μικρή / μικρό often means:

• small
• low

So in natural English, depending on context, this could be:

• The bank fee is small
• The bank fee is low

The accents show which syllable is stressed.

In this sentence:

• τραπεζική → stress on κή
• προμήθεια → stress on μή
• είναι → stress on εί
• μικρή → stress on ρή

Stress matters in Greek pronunciation, so the accents are an important part of the written language.

No. The only difference is capitalization.

• Η = capital letter
• η = lowercase letter

Both are pronounced ee in Modern Greek.

So at the beginning of a sentence you write Η, but the sound stays the same.

In standard Greek, that would usually sound incomplete or unnatural for a normal sentence.

The article is normally used here:

• Η τραπεζική προμήθεια είναι μικρή

Greek uses definite articles much more often than English does. Omitting the article may happen in special styles, but for a learner, the safe and natural version is to keep η.