هذه الخدمة في البنك جيدة، لكن كل زبون ينتظر دوره.

هذه means this for a feminine singular noun. It agrees with الخدمة (the service), which is feminine.

So:

• هذه الخدمة = this service

In Arabic, demonstratives must match the noun in gender and number. Since الخدمة is feminine singular, you use هذه, not هذا.

A very common clue is the ending ـة (called taa marbuuTa). Nouns ending in ـة are very often feminine.

So:

• خدمة = service
• الخدمة = the service

Because it is feminine, words that describe it or point to it also become feminine, such as:

• هذه = this (feminine)
• جيدة = good (feminine)

In Arabic, in the present tense, the verb to be is usually not stated.

So Arabic says literally something like:

• this service in the bank good

but it means:

• This service in the bank is good

This is completely normal in Arabic. If you wanted past or future, then forms of كان might appear, but in the present tense there is usually no separate word for is / are / am.

في means in, and البنك means the bank.

So:

• في البنك = in the bank

This phrase tells you where the service is. It modifies the idea of the service, giving the location:

• هذه الخدمة في البنك جيدة
  = This service in the bank is good

Notice also that في is a preposition, so the noun after it is in the genitive case in full formal grammar, though short vowels are usually not written in normal text.

Because adjectives in Arabic usually agree with the noun they describe in gender, number, and definiteness.

Here the noun is:

• الخدمة = feminine singular definite

So the adjective must match:

• جيدة = good (feminine singular)

You would not normally use جيد here, because جيد is masculine singular.

So:

• خدمة جيدة = a good service
• الخدمة جيدة = the service is good

This is a very common question. In Arabic, when an adjective comes directly after a noun inside a noun phrase, it matches the noun in definiteness:

• الخدمة الجيدة = the good service

But in your sentence, جيدة is not simply part of the noun phrase. It is the predicate of the sentence:

• الخدمة جيدة = the service is good

In this kind of sentence, the predicate adjective is typically indefinite. So جيدة here is correct.

Compare:

• الخدمة الجيدة = the good service
• الخدمة جيدة = the service is good

That distinction is very important in Arabic.

لكن means but.

It connects the first idea with a contrasting second idea:

• هذه الخدمة في البنك جيدة، لكن كل زبون ينتظر دوره.

So the meaning is something like:

• The service is good, but each customer waits for his turn.

In simple reading, think of لكن as the standard word for but introducing contrast.

كل means every or each, and it is commonly followed by a singular noun.

So:

• كل زبون = every customer / each customer

This is similar to English, where we also say every customer, not every customers.

Even though the meaning refers to all customers one by one, the noun after كل is singular.

Because grammatically كل زبون is singular:

• كل
  • singular noun = each/every + singular noun

So the verb agrees with the singular noun زبون:

• كل زبون ينتظر = every customer waits / is waiting

Arabic is treating each customer individually, not as a plural group.

ينتظر is the imperfect verb form. In Modern Standard Arabic, this form can cover several present-related meanings depending on context.

So it may mean:

• waits
• is waiting
• sometimes even does wait

In this sentence, English could translate it naturally as either:

• Every customer waits for his turn
• Every customer is waiting for his turn

The exact English choice depends on style and context.

This is a very useful structure.

• دور = turn / role
• ـه = his (attached pronoun)

So:

• دوره = his turn

The attached pronoun ـه refers back to كل زبون (each customer).

This kind of possession is extremely common in Arabic:

• كتابه = his book
• بيتها = her house
• اسمهم = their name

So in your sentence:

• كل زبون ينتظر دوره = each customer waits for his turn

In fully vocalized formal Arabic, case endings may be shown, and you could see something like دورَهُ depending on grammatical position. But in normal Arabic writing, short vowels and many final endings are usually not written.

So learners typically see:

• دوره

instead of a fully marked form.

This is normal. Most printed Arabic leaves those endings unwritten unless the text is for learners, scripture, poetry, or very careful grammatical presentation.

زبون is a common word for customer/client, and in this sentence it is perfectly natural.

Depending on context, Arabic may also use other words such as:

• عميل = client/customer

But زبون is very understandable and common in everyday contexts such as shops, services, and businesses.

In this sentence, it simply means customer.

Arabic allows more than one common word order. Two major patterns are:

• verb–subject
• subject–verb

Here you have:

• كل زبون = subject
• ينتظر = verb

So this is a subject-first sentence:

• كل زبون ينتظر دوره

This order is very common, especially when the subject is something the speaker wants to present clearly as the topic.

A verb-first version would also be possible in many contexts, but the given order is completely normal and easy for learners to understand.

A few pronunciation points may help:

• هذه is usually pronounced in MSA something like haadhihi or in pause often haadhihi / haadhih depending on style.
• The letter ذ in هذه sounds like the th in this.
• زبون begins with ز, like z in zoo.

Also:

• الخدمة has kh in many transliterations for خ, a sound not found in standard English; it is pronounced farther back in the throat.
• البنك often sounds close to al-bank.

Exact pronunciation can vary somewhat between careful MSA reading and regional habits, but those are the main points.

Yes. دور can have more than one meaning depending on context, such as:

• turn
• role
• sometimes other related senses

But in this sentence, with ينتظر (waits/is waiting), the meaning is clearly:

• turn

So ينتظر دوره means:

• waits for his turn

Context usually makes the meaning clear.