Otobüste kırk yolcu var.

Yes:

• otobüs = bus
• otobüste = in/on the bus
• kırk = forty
• yolcu = passenger
• var = there is / there are / exists

So the sentence follows a very common Turkish pattern:

• [location] + [number + noun] + var

Literally, it is something like:

• On the bus, forty passenger exists

Natural English: There are forty passengers on the bus.

Because Turkish uses the locative suffix to mean in / on / at, and that suffix changes form according to vowel harmony and consonant harmony.

The locative suffix has four forms:

• -da
• -de
• -ta
• -te

Here is why otobüs + te becomes otobüste:

1. The last vowel in otobüs is ü, which is a front vowel, so the suffix must be -de or -te.
2. The word ends in s, which is a voiceless consonant, so d changes to t.

So:

• otobüs + te = otobüste

This means in/on the bus.

In Turkish, otobüste is the normal way to express being on a bus.

English usually says:

• on the bus

But Turkish uses the locative suffix -de/-da/-te/-ta, which broadly covers in, on, at depending on context.

So although the form may look more like in the bus to an English speaker, the natural translation here is:

• on the bus

The same thing happens with many vehicles and places in Turkish.

Because in Turkish, nouns after numbers are normally singular, not plural.

So Turkish says:

• kırk yolcu = forty passenger

not

• kırk yolcular

This is completely normal Turkish grammar.

A few examples:

• iki kitap = two books
• beş öğrenci = five students
• on araba = ten cars

So kırk yolcu var is correct, and kırk yolcular var would usually be wrong in standard usage.

Var expresses existence. In sentences like this, it usually means:

• there is
• there are

So:

• Otobüste kırk yolcu var = There are forty passengers on the bus

It does not behave exactly like an ordinary English verb. It is part of a very common Turkish pair:

• var = there is / there are / exists
• yok = there isn’t / there aren’t / does not exist

For example:

• Otobüste kırk yolcu var. = There are forty passengers on the bus.
• Otobüste yolcu yok. = There are no passengers on the bus.

Turkish word order is more flexible than English, but this sentence has a very natural, neutral structure.

The order here is:

• Otobüste = location/topic
• kırk yolcu = the thing being counted
• var = existence

So the sentence presents the setting first, then says what exists there.

This is a very common pattern in Turkish:

• Masada bir kitap var. = There is a book on the table.
• Bahçede iki kedi var. = There are two cats in the garden.

Other word orders are possible in some contexts, but Otobüste kırk yolcu var is the most straightforward and natural version.

Turkish often does not use articles the way English does.

There is no separate word here corresponding directly to there are forty passengers on the bus with English-style articles.

A few key points:

• otobüste already means in/on the bus
• yolcu can mean passenger or passengers depending on context
• the number kırk makes it clear that we mean a plural quantity

Turkish does have bir, which can mean one and sometimes a/an, but it is not used here because the sentence is about forty passengers, not one passenger.

Normally, no.

After a number, Turkish usually keeps the noun singular, and that is already completely clear.

So the correct standard form is:

• kırk yolcu

not

• kırk yolcular

The number itself already tells you there is more than one.

Adding the plural ending after a numeral is generally not how standard Turkish works.

A rough pronunciation guide is:

• otobüste ≈ oh-toh-BUUS-teh
• kırk ≈ kuhrk
• yolcu ≈ yol-joo
• var ≈ vahr

A few useful pronunciation notes:

• ö is like the vowel in French deux or German schön
• ü is like the vowel in French tu or German über
• ı in kırk is the Turkish undotted i, a sound English does not have exactly; it is somewhat like a short, relaxed uh, but further back in the mouth
• c in Turkish is pronounced like English j in job

So a more connected rough version would be:

• oh-toh-BUUS-teh kuhrk yol-joo vahr

Yolcu most commonly means passenger or traveler.

Its basic idea is someone who is on a journey or traveling. In the sentence Otobüste kırk yolcu var, the natural meaning is clearly passenger, because we are talking about people on a bus.

So while the word can be broader in some contexts, here passenger is the best interpretation.