Onlar çok pahalı görünüyor.

Yes. Turkish often drops subject pronouns when the subject is clear from context.

So Çok pahalı görünüyor. can also be a perfectly natural sentence.

Adding Onlar can:

• make the subject clearer
• add contrast, like they in They look very expensive, not the others
• help if you are pointing out which things you mean

So Onlar is possible, but not always necessary.

Görünüyor comes from the verb görünmek.

A simple breakdown is:

• görün- = appear / be seen / look
• -üyor = present continuous-style ending

So görünüyor means something like:

• is appearing
• appears
• looks
• seems

In natural English for this sentence, looks or seems is usually best.

Also, görünmek is related to görmek (to see), but it does not mean to see here.

This is a very common question.

In Turkish, third-person plural agreement is often looser than in English. When the subject is already clearly plural, the verb may stay in the third-person singular form.

So Onlar çok pahalı görünüyor is natural, especially if onlar refers to things, not people.

You may also hear görünüyorlar, especially:

• with people
• when the speaker wants to stress the plural subject
• in more explicit or careful speech

So:

• Onlar çok pahalı görünüyor. = very natural
• Onlar çok pahalı görünüyorlar. = also possible in some contexts

Here, çok means very.

It is modifying the adjective pahalı.

So:

• çok pahalı = very expensive

In other contexts, çok can also mean:

• many
• much
• a lot

But before an adjective like pahalı, it usually means very.

Pahalı is an adjective meaning expensive.

Turkish adjectives do not change for singular/plural or gender.

So the same form is used with:

• one thing
• many things
• masculine/feminine subjects

Examples:

• Bu pahalı. = This is expensive.
• Bunlar pahalı. = These are expensive.

So even though onlar is plural, pahalı stays pahalı.

The difference is about certainty and appearance.

• Onlar çok pahalı. = They are very expensive.
  This is a direct statement.

• Onlar çok pahalı görünüyor. = They look / seem very expensive.
  This is based on appearance or impression.

So görünüyor adds the idea of it seems that...

No, they are different verbs:

• görmek = to see
• bakmak = to look at
• görünmek = to appear / to be visible / to look / to seem

In this sentence, the subject is the thing giving an impression, so görünmek is the right verb.

A rough comparison:

• Onlara bakıyorum. = I am looking at them.
• Onları görüyorum. = I see them.
• Onlar pahalı görünüyor. = They look expensive.

Grammatically, -yor is the Turkish present continuous marker, but its meaning is often broader than the English -ing form.

So görünüyor can mean:

• is appearing
• appears
• looks
• seems

In this sentence, English usually uses look or seem, not are looking.

That is normal. Turkish -yor does not always match English -ing exactly.

Yes, depending on context.

Onlar can function like:

• they
• those
• those ones

If you are talking about some visible items, Onlar çok pahalı görünüyor could feel like Those look very expensive.

If you are referring back to previously mentioned people or things, it may feel more like They look very expensive.

Context decides which English version sounds best.

Yes. Turkish word order is flexible, though some orders sound more neutral than others.

Onlar çok pahalı görünüyor is a normal, neutral order.

You might also hear different orders for emphasis, such as:

• Çok pahalı görünüyorlar.
• Pahalı görünüyor onlar.
  This is more marked and depends on context.

For learners, the safest version is the original:

• Onlar çok pahalı görünüyor.

Turkish often does not use a separate present-tense to be word the way English does.

In this sentence, the main verb is görünüyor, so there is no need for a separate are.

Even in a sentence without görünüyor, Turkish often leaves the present-tense copula unspoken:

• Onlar çok pahalı. = They are very expensive.

So Turkish handles to be very differently from English.