الشرطة ناقشت الجريمة.

In Arabic, الشرطة is treated as a singular feminine noun, even though in English police is grammatically plural.

So the verb agrees with it as feminine singular:

• ناقش = he discussed
• ناقشت = she/it discussed

That is why you get الشرطة ناقشت...

This is very normal in both formal Arabic and Levantine-style usage.

No. الشرطة means the police as an institution or force.

If you want a policewoman, that is usually شرطية.

So:

• الشرطة = the police
• شرطية = a policewoman

Even though الشرطة is grammatically feminine, it does not mean one female officer.

The -ت is part of the past tense feminine singular verb form.

The base verb is ناقش = to discuss.

In the past tense:

• ناقش = he discussed
• ناقشت = she/it discussed

Since الشرطة is grammatically feminine singular, the verb becomes ناقشت.

Yes, this word order is completely normal.

This sentence is:

• الشرطة = subject
• ناقشت = verb
• الجريمة = object

So it is subject–verb–object.

Arabic can also use verb–subject–object, for example:

• ناقشت الشرطة الجريمة

Both are possible. In everyday speech, especially in Levantine, subject-first order is very common.

Because both nouns are definite:

• الشرطة = the police
• الجريمة = the crime

Arabic usually marks definiteness on each noun individually with ال. So if both nouns are definite, both normally take ال.

In الشرطة, the ل of ال is not pronounced normally, because ش is a sun letter.

So الشرطة is pronounced roughly like:

• esh-shurṭa / ish-shurṭa

not:

• al-shurṭa

By contrast, in الجريمة, the ل is pronounced, because ج is not a sun letter.

As written, it is perfectly natural in Standard Arabic, and it is also easy for Levantine speakers to understand.

For Levantine specifically:

• the grammar is fine
• the pronunciation would be more colloquial
• some speakers might use البوليس instead of الشرطة in everyday speech

So the sentence is good, but it sounds a bit neutral/formal rather than strongly colloquial.

No. ناقشت means discussed, talked over, or debated.

So this sentence means that the police discussed the crime, not that they investigated it.

If you want investigated, Arabic would usually use a different verb, such as:

• حققت في الجريمة = investigated the crime

That is an important difference, because English learners may expect police + crime to imply investigation, but ناقش does not mean that.

الجريمة is the direct object of the verb ناقشت.

It is the thing being discussed.

So the structure is:

• الشرطة = the doer
• ناقشت = the action
• الجريمة = what was discussed

In Levantine, there is no extra word needed before الجريمة. It comes directly after the verb as the object.

Yes. ناقشت comes from the root ن-ق-ش.

The dictionary form is ناقش.

This is useful because Arabic vocabulary is built around roots and patterns. If you recognize ناقش, you can also recognize related forms such as:

• مناقشة = discussion
• يناقش = he discusses / he is discussing

So learning the root-and-pattern system helps you connect words much faster.