Νομίζω ότι το κίτρινο φούτερ ταιριάζει με τα μαύρα αθλητικά σου.

Ότι means that and introduces a clause after verbs like νομίζω (I think).

So:

• Νομίζω ότι... = I think that...

Just like in English, that can sometimes be omitted in translation, but in Greek ότι is very common and natural here. You may also see πως used in the same way in everyday Greek:

• Νομίζω ότι...
• Νομίζω πως...

Both mean the same thing here.

Greek usually uses the definite article more often than English, and here το means the.

So:

• το φούτερ = the sweatshirt / hoodie
• το κίτρινο φούτερ = the yellow sweatshirt / hoodie

In this sentence, the speaker is referring to a specific item, so το is expected.

The adjective has to agree with the noun in gender, number, and case.

Here:

• φούτερ is treated as neuter singular
• so the adjective must also be neuter singular
• therefore: κίτρινο

Compare:

• ο κίτρινος ... = masculine
• η κίτρινη ... = feminine
• το κίτρινο ... = neuter

So το κίτρινο φούτερ is correct because φούτερ is neuter.

Φούτερ is a loanword, borrowed from English sweater / footer-type fashion vocabulary, though in Modern Greek it usually refers to a sweatshirt, often a hoodie-style top depending on context.

It is commonly treated as a neuter noun:

• το φούτερ
• του φούτερ

Many loanwords in Greek are less obviously inflected than older native words, so they can look more fixed in form.

Ταιριάζει is the 3rd person singular present tense of ταιριάζω, which means things like:

• to match
• to suit
• to go well with

Here the subject is:

• το κίτρινο φούτερ

That subject is singular, so the verb is singular too:

• το φούτερ ταιριάζει = the sweatshirt matches / goes well

Because ταιριάζω often takes με when you mean match with or go with.

So:

• ταιριάζει με τα μαύρα αθλητικά σου = it matches your black sneakers

This is a very common pattern:

• Αυτό ταιριάζει με εκείνο. = This goes with that.

Literally, αθλητικά comes from the idea of athletic/sportswear, but in everyday Greek it very often means trainers / sneakers / athletic shoes.

So in this sentence:

• τα μαύρα αθλητικά σου = your black sneakers

Native speakers commonly use αθλητικά this way, especially when the context is clothing and footwear.

Again, the adjective has to agree with the noun.

Here:

• αθλητικά is plural
• and in this sentence it is neuter plural

• so the article and adjective must also be neuter plural:

  • τα = neuter plural the
  • μαύρα = black in neuter plural
  • αθλητικά = sneakers / athletic shoes

So:

• τα μαύρα αθλητικά = the black sneakers

In Greek, weak possessive forms like μου, σου, του, της, μας, σας, τους usually come after the noun.

So:

• τα αθλητικά σου = your sneakers
• literally something like the sneakers your

This is completely normal Greek word order.

You can think of:

• μου = my
• σου = your
• του/της = his/her

But structurally, Greek places them after the noun.

Yes, Greek word order is more flexible than English, but the version here is the most neutral and natural.

Standard order:

• Νομίζω ότι το κίτρινο φούτερ ταιριάζει με τα μαύρα αθλητικά σου.

You might also hear variations for emphasis, but beginners should stick with this pattern:

• I think + ότι + subject + verb + με + object

That will sound natural and correct.

Sometimes, especially in casual speech, speakers may omit it:

• Νομίζω το κίτρινο φούτερ ταιριάζει...

But for learners, it is safer and more standard to keep ότι:

• Νομίζω ότι...

Using it makes the structure clearer and is always acceptable.

Because Greek verbs already show the person and number, and the subject can simply be the noun itself.

Here the subject is explicitly stated:

• το κίτρινο φούτερ ταιριάζει

So Greek does not need an extra word like it. The noun το κίτρινο φούτερ is already doing that job.

English says:

• the yellow sweatshirt matches

Greek says the same thing directly:

• το κίτρινο φούτερ ταιριάζει