Ben mutfakta yemek yapıyorum, sen ise balkonda çay içiyorsun.

Not usually. In Turkish, the verb ending already shows the subject:

• yapıyorum = I am doing / cooking
• içiyorsun = you are drinking

So you could say:

• Mutfakta yemek yapıyorum, balkonda ise çay içiyorsun.

The pronouns ben and sen are often added for emphasis, contrast, or clarity. In this sentence, they help highlight the contrast between I and you.

Here, ise adds contrast. It is similar to:

• whereas
• while
• as for
• on the other hand

So:

• sen ise = you, on the other hand / whereas you

It is not the main verb here. Its job is to contrast the second clause with the first one.

Because Turkish uses the locative case to mean in / at / on a place.

• mutfak = kitchen
• mutfakta = in the kitchen
• balkon = balcony
• balkonda = on the balcony / in the balcony

The locative ending is:

• -da / -de / -ta / -te

Which form you use depends on:

1. vowel harmony
2. whether the last consonant is voiced or voiceless

So:

• mutfak ends in k (voiceless) → mutfakta
• balkon ends in n (voiced) → balkonda

Because çay here is a non-specific / general object.

In Turkish, a direct object often stays without the accusative ending if it is indefinite or generic:

• çay içiyorum = I am drinking tea
• kitap okuyorum = I am reading a book / reading books

But if the object is specific, known, or definite, Turkish usually uses the accusative:

• çayı içiyorsun = you are drinking the tea (a specific tea)

So in your sentence, çay just means tea in a general sense, not a particular cup already identified.

Yemek can mean two different things depending on context:

1. to eat as a dictionary form
2. food / meal

In yemek yapmak, it means food, so the phrase literally means:

• to make food

and naturally translates as:

• to cook

So:

• mutfakta yemek yapıyorum = I am cooking in the kitchen

This is a very common Turkish expression.

Yapıyorum can be broken down like this:

• yap- = do / make
• -ıyor = present continuous
• -um = I

So:

• yap-ıyor-um → yapıyorum
• meaning: I am doing / I am making

In this sentence, because of yemek yapmak, it means I am cooking.

The present continuous suffix is often shown as -Iyor, where the first vowel changes by vowel harmony:

• -ıyor
• -iyor
• -uyor
• -üyor

It breaks down like this:

• iç- = drink
• -iyor = present continuous
• -sun = you (singular)

So:

• iç-iyor-sun → içiyorsun
• meaning: you are drinking

Again, Turkish puts both the tense and the person into the verb itself, so no separate word for are is needed.

Because Turkish usually expresses that meaning through verb endings, not separate words.

Compare:

• English: I am cooking
• Turkish: yapıyorum

The Turkish verb already contains:

• the action
• the ongoing tense
• the subject

So yapıyorum already means I am doing / I am making, and içiyorsun already means you are drinking.

Turkish word order is more flexible than English, but the default order is often:

• subject + place/time + object + verb

So:

• Ben mutfakta yemek yapıyorum.
• Sen ise balkonda çay içiyorsun.

This is very natural.

You can move parts around for emphasis, but the verb usually stays near the end:

• Mutfakta yemek yapıyorum.
• Balkonda ise çay içiyorsun.

So the sentence you have is standard and neutral, with a slight contrast created by ise.