ينتظر مقدمو الطلبات حول شباك الخدمة.

Because the sentence is using the common verb–subject order in Modern Standard Arabic:

• ينتظر = waits / are waiting
• مقدمو الطلبات = the applicants

In MSA, when the verb comes before a plural subject, the verb is often kept in the singular, while still matching the subject in gender. Since مقدمو الطلبات is masculine plural, the verb appears in the masculine singular: ينتظر.

If you put the subject first, full plural agreement is normal:

• مقدمو الطلبات ينتظرون حول شباك الخدمة.

So both patterns are possible, but this sentence uses the standard verb-first structure.

Literally, it means the submitters of the applications.

Breakdown:

• مقدمو = submitters / presenters
• الطلبات = the applications / requests

Together, the phrase means the applicants in natural English.

The word مقدِّم comes from the verb قدَّمَ, which means to present / submit.
Its masculine sound plural is مقدِّمون, but here it appears as مقدِّمو because it is part of an iḍāfa construction.

Because مقدمو is in an iḍāfa construction, and in an iḍāfa, the nūn at the end of the masculine sound plural is dropped.

Compare:

• مقدِّمون = submitters
• مقدِّمو الطلبات = submitters of the applications

This is a standard rule:

• -ون / -ين loses the final ن when the word is the first part of an iḍāfa.

So:

• مقدِّمون → مقدِّمو before another noun
• مقدِّمين → مقدِّمي before another noun

Because in an iḍāfa construction, the first noun usually does not take ال, even when the whole phrase is definite.

Here:

• مقدمو الطلبات
• literally: submitters of the applications

Since the second noun الطلبات is definite, the whole phrase becomes definite. So the whole expression can mean the applicants, even though مقدمو itself does not have الـ.

This is a very common Arabic pattern.

It is an iḍāfa construction, often called a genitive construction.

In an iḍāfa:

1. The first noun is the thing being described.
2. The second noun tells you what it is related to.

So here:

• مقدمو = submitters
• الطلبات = the applications

Together:

• مقدمو الطلبات = submitters of the applications

This same pattern appears again in:

• شباك الخدمة = the service window

Arabic uses iḍāfa very often where English uses of or a noun-noun phrase.

Here حول means around.

So:

• حول شباك الخدمة = around the service window

A useful point: حول can have different meanings in different contexts, such as about / concerning, but in this sentence it is clearly spatial, meaning around or surrounding.

In fully vocalized Arabic, it is usually written:

• حَوْلَ

Traditional grammar often treats it as a noun of place used like a preposition.

Yes. شباك literally means window, but in many public-service contexts it often means a service window or counter, like the window at a ticket office, bank, or government office.

So:

• شباك = window / counter
• الخدمة = the service

Together:

• شباك الخدمة = the service window or service counter

This is another iḍāfa construction, so literally it is window of the service, but natural English is the service window.

If fully vocalized, the sentence would be:

يَنتَظِرُ مُقَدِّمُو الطَّلَبَاتِ حَوْلَ شُبَّاكِ الخِدْمَةِ

Here is the grammar:

• يَنتَظِرُ
  Indicative verb: he waits / they wait in this structure

• مُقَدِّمُو
  Nominative, because it is the subject
  It is a masculine sound plural in iḍāfa, so the final ن is dropped

• الطَّلَبَاتِ
  Genitive, because it is the second term of the iḍāfa

• حَوْلَ
  Normally treated as a spatial adverb/preposition-like word

• شُبَّاكِ
  Genitive after حولَ

• الخِدْمَةِ
  Genitive because it is the second term of the iḍāfa شباك الخدمة

So there are two iḍāfa constructions in the sentence:

• مقدمو الطلبات
• شباك الخدمة

Yes. That is also correct.

This version uses subject–verb order instead of verb–subject order:

• مقدمو الطلبات ينتظرون حول شباك الخدمة.

When the subject comes first, the verb normally shows full agreement, so you get:

• ينتظرون instead of ينتظر

So:

• ينتظر مقدمو الطلبات... = verb first, verb singular
• مقدمو الطلبات ينتظرون... = subject first, verb plural

Both are grammatical in MSA.

The basic verb is:

• اِنْتَظَرَ = to wait

Its present/imperfect form is:

• يَنْتَظِرُ = he waits / he is waiting

This verb comes from the root:

• ن ظ ر

That root is connected with ideas of looking and considering, but اِنْتَظَرَ specifically means to wait.

So in this sentence:

• ينتظر = waits / are waiting

The exact English translation depends on the structure of the sentence, not just the isolated form of the verb.

Yes. طلبات is the plural of طلب, and depending on context it can mean:

• requests
• applications
• sometimes orders

In this sentence, the context makes applications the natural meaning, so مقدمو الطلبات means applicants.

Arabic often uses broader words whose exact English translation depends on context. So طلب does not always have just one fixed translation.