Το γκρι μου αρέσει περισσότερο από το μαύρο.

Because αρέσω works differently from English like.

Greek structures it more like:

• X pleases me = Μου αρέσει το Χ

So in this sentence:

• Το γκρι μου αρέσει... literally means something like Grey is pleasing to me...

That is why the person who feels the liking is not the subject of the verb. The thing liked is the grammatical subject.

μου means to me.

It is the weak form of the pronoun and shows who is pleased by something:

• μου αρέσει = is pleasing to me
• σου αρέσει = is pleasing to you
• του/της αρέσει = is pleasing to him/her

So:

• Το γκρι μου αρέσει = I like grey / more literally, Grey pleases me

Because the subject is singular: Το γκρι.

In Greek, αρέσει agrees with the thing that is liked, not with the person doing the liking.

Compare:

• Το γκρι μου αρέσει. = I like grey.

  • subject: το γκρι → singular
  • so the verb is αρέσει

• Τα χρώματα μου αρέσουν. = I like the colors.

  • subject: τα χρώματα → plural
  • so the verb is αρέσουν

Because Greek often uses the definite article with colors when the color itself is being treated as a noun.

So:

• το γκρι = grey / the color grey
• το μαύρο = black / the color black

This is very natural in Greek. English often leaves out the in this kind of sentence, but Greek usually does not.

You can think of an implied noun like χρώμα (color), or simply of the color word being used as a noun.

When Greek uses a color word to mean the color itself, it commonly uses the neuter singular.

So:

• το μαύρο = black as a color
• το άσπρο = white
• το κόκκινο = red

This is similar to saying the black one or the color black, but in practice it simply means the color.

With γκρι, the word does not change form, but it still takes the neuter article το, so it behaves like a neuter singular noun here.

Because γκρι is usually treated as an indeclinable color word in modern Greek. That means its form stays the same.

So you get:

• το γκρι
• του γκρι
• τα γκρι

The word γκρι itself stays γκρι.

But μαύρος / μαύρη / μαύρο is a regular Greek adjective, so it changes form depending on gender, number, and case.

Here it appears as:

• το μαύρο = neuter singular

It means more than.

So:

• περισσότερο = more
• από = than

Together:

• περισσότερο από το μαύρο = more than black

This is the standard way to make this comparison in everyday Greek.

Yes. In more formal or careful language, you may also see παρά after comparatives.

For example:

• Το γκρι μου αρέσει περισσότερο παρά το μαύρο.

But for most learners, περισσότερο από is the most useful and common pattern.

Greek often expresses preference by saying that one thing is liked more than another.

So instead of using a direct equivalent of prefer in simple everyday speech, Greek commonly says:

• Μου αρέσει περισσότερο... = I like ... more

That is exactly what is happening here:

• Το γκρι μου αρέσει περισσότερο από το μαύρο.

There is also a verb προτιμώ (I prefer), so another way to express a similar idea would be:

• Προτιμώ το γκρι από το μαύρο.

But the sentence you were given uses the very common μου αρέσει περισσότερο pattern.

Yes. Greek word order is more flexible than English word order.

These are all natural, with slightly different emphasis:

• Το γκρι μου αρέσει περισσότερο από το μαύρο.
• Μου αρέσει περισσότερο το γκρι από το μαύρο.
• Μου αρέσει το γκρι περισσότερο από το μαύρο.

Starting with Το γκρι puts a bit more focus on grey. Starting with Μου αρέσει sounds a bit more neutral in many contexts.

So the sentence you have is correct, but it is not the only possible word order.

In this sentence, it means the color black.

Greek often uses an adjective with the article as a noun. So το μαύρο can literally be understood as the black thing or the black one, but in a context about colors it naturally means black as a color.

The same idea applies to το γκρι here.

Context tells you what is meant, and in this sentence the comparison clearly shows that two colors are being compared.

Yes. You could make the noun color explicit:

• Το γκρι χρώμα μου αρέσει περισσότερο από το μαύρο χρώμα.

That is grammatical, but it sounds heavier and less natural in everyday conversation unless you need to be very explicit.

Usually Greek just says:

• το γκρι
• το μαύρο

because the meaning is already clear.

A close literal breakdown is:

• Το γκρι = the grey
• μου = to me
• αρέσει = is pleasing
• περισσότερο = more
• από = than
• το μαύρο = the black

So very literally:

• The grey is pleasing to me more than the black.

That is not natural English, but it helps explain the Greek grammar. The normal English translation is:

• I like grey more than black.

A few useful points:

• γκρι sounds roughly like gkree.
  In modern Greek, γκ at the start of a word is usually pronounced like g.
• αρέσει is stressed on ρέ: a-RE-si
• περισσότερο is stressed on σό: pe-ri-SO-te-ro
• μαύρο is stressed on μαύ: MAV-ro

So the rhythm is roughly:

• to GKRI mou a-RE-si pe-ri-SO-te-ro a-PO to MAV-ro

You do not need to pronounce it exactly like English sounds, but noticing the stress helps a lot.