Αν θες, άσε το πανωφόρι σου στην καρέκλα και πάρε μια κούπα ζεστό τσάι.

Θες is a very common shortened form of θέλεις, the you want form of θέλω.

So:

• αν θες = if you want
• αν θέλεις = also if you want

Both are correct. Θες sounds a bit more conversational and natural in everyday speech.

Αν means if.

So Αν θες literally means If you want or If you'd like.

This is a very common way to make a suggestion sound softer and friendlier in Greek.

These are imperative forms, used to tell someone to do something.

• άσε = leave
• πάρε = take

They are both singular informal commands, used when speaking to one person in a familiar way.

So:

• άσε το πανωφόρι σου = leave your coat
• πάρε μια κούπα ζεστό τσάι = take/have a mug of hot tea

Yes. Άσε and πάρε are for one person informally.

If you wanted to say the same thing politely or to more than one person, you would use the plural/formal imperative:

• Αν θέλετε, αφήστε το πανωφόρι σας στην καρέκλα και πάρτε μια κούπα ζεστό τσάι.

Notice these changes:

• θες → θέλετε
• άσε → αφήστε
• σου → σας
• πάρε → πάρτε

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

So:

• το πανωφόρι σου = your coat
• literally: the coat your

This is normal Greek structure. English says your coat, but Greek usually says the coat your.

Also, Greek often keeps the article:

• το πανωφόρι σου
• not just πανωφόρι σου in this kind of everyday sentence

Πανωφόρι is a neuter noun meaning something like:

• coat
• overcoat
• outer garment

In everyday translation, coat is usually the most natural choice.

It is neuter, which is why the article is το:

• το πανωφόρι

Στην is a contraction of:

• σε
  • την = στην

So:

• στην καρέκλα = on the chair / in the chair / at the chair, depending on context

Here the natural English translation is on the chair.

A useful thing to know is that σε in Modern Greek covers several meanings that English separates into in, on, at, to. Context tells you which one is meant.

Modern Greek often uses σε very broadly for location and direction.

So the same basic preposition can mean:

• in
• on
• at
• to

depending on context.

That is why:

• στην καρέκλα can naturally mean on the chair

Greek does have more specific expressions in some cases, but σε is extremely common and often enough by itself.

Because κούπα is a feminine noun.

So the feminine form of a/an is used:

• μια κούπα = a mug

Compare:

• ένας καφές = a coffee masculine
• μια κούπα = a mug feminine
• ένα τσάι = a tea neuter

The article/adjective has to match the gender of the noun it goes with.

This is a very common Greek pattern: container + thing inside.

So Greek often says:

• μια κούπα ζεστό τσάι
• literally: a mug hot tea

English needs of, but Greek often does not.

The same kind of structure appears in expressions like:

• ένα ποτήρι νερό = a glass of water
• ένα φλιτζάνι καφέ = a cup of coffee

So do not try to force an English-style of structure into Greek here.

Because ζεστό describes τσάι, not κούπα.

• κούπα is feminine
• τσάι is neuter

So the adjective agrees with τσάι:

• ζεστό τσάι = hot tea

If the adjective described κούπα, it would be feminine:

• μια ζεστή κούπα = a warm mug

But that would mean the mug is warm, not the tea.

After words like κούπα, ποτήρι, φλιτζάνι, Greek often leaves the following noun without an article.

So:

• μια κούπα ζεστό τσάι
• ένα ποτήρι κρύο νερό
• ένα φλιτζάνι ελληνικό καφέ

This is normal and idiomatic.

Adding an article there would usually sound less natural in a simple sentence like this.

It can do both, depending on context.

Literally:

• πάρε = take

But in a hospitable situation, like offering tea, it can sound more like:

• have a mug of hot tea
• go ahead and take a mug of hot tea

So the meaning is broader than just physically grabbing something. It often works like a friendly offer.

Yes, very natural.

It sounds like something a host might say to a guest:

• Αν θες makes it friendly and non-pushy
• άσε το πανωφόρι σου στην καρέκλα sounds casual and welcoming
• πάρε μια κούπα ζεστό τσάι sounds warm and hospitable

A native speaker would find this very normal in everyday conversation.