المحقق مع الشرطة.

Because Arabic usually leaves out the present-tense verb to be.

So:

• المحقق = the investigator
• مع الشرطة = with the police

Put together, that naturally means The investigator is with the police.

This kind of sentence is called a nominal sentence. If you wanted a past meaning, Arabic would normally add a verb such as كان.

مع means with.

In this sentence, it shows association or company:

• physically together: with the police
• possibly connected/working alongside them, depending on context

In Levantine speech, مع is usually pronounced maʿ.

Because both nouns are definite.

• المحقق = the investigator
• الشرطة = the police

Arabic marks definiteness very clearly with الـ. English does not always match word-for-word, but here both are definite in both languages.

If you removed الـ from محقق, it would mean an investigator rather than the investigator.

Because ش is a sun letter.

When الـ comes before a sun letter, the l sound of الـ disappears in pronunciation and the next consonant is doubled.

So الشرطة is pronounced more like:

• in careful Standard Arabic: ash-shurṭa
• in Levantine-style pronunciation: often eš-šurṭa or ish-shurṭa

But it is still written الشرطة.

The written form المحقق مع الشرطة is very natural in Standard Arabic, and a Levantine speaker would also understand it easily.

In spoken Levantine, the pronunciation changes, for example:

• المحقق may sound more like el-mḥaʔʔeʔ or a similar local variant
• مع = maʿ
• الشرطة = eš-šurṭa

So the wording is quite neutral, but the sound of it in everyday speech would be more Levantine.

The structure is:

• المحقق = the topic/subject
• مع الشرطة = a prepositional phrase acting as the predicate

So literally, the pattern is:

• the investigator — with the police

This is a very common Arabic structure: noun + prepositional phrase, with no present-tense is.

Grammatically, الشرطة is usually treated as a singular feminine collective noun.

Even though English police refers to many people, Arabic often treats الشرطة more like the police force or the police institution.

So this is normal Arabic usage, even if it does not match English grammar exactly.

In careful reading, it is al-muḥaqqiq.

A few things make it tricky for English speakers:

• ح is a strong breathy h sound, not the normal English h
• ق is a deep q sound in Standard Arabic, though in many Levantine accents it may sound like a glottal stop
• the middle consonant is doubled: -qq-

In Levantine speech, it is often reduced in everyday pronunciation, something like el-mḥaʔʔeʔ, though this varies by region and speaker.

If you are just starting, a reasonable approximation is: mu-haq-qiq, then refine it over time.

Yes. Depending on context, it can suggest slightly different things:

• The investigator is physically with the police
• The investigator is accompanying the police
• The investigator is associated with / working alongside the police

If you want to say very specifically that someone works for the police, Arabic can use clearer wording in context. But as a simple sentence, مع الشرطة is natural and understandable.