يفتش الفريق الحجرة المخفية ويكتشف الدليل.

Because verb-first word order is very common in Arabic, especially in Modern Standard Arabic.

So:

• يفتش الفريق = The team searches / is searching
• literally: searches the team

This is called a verbal sentence.

You could also say:

• الفريق يفتش الحجرة المخفية
  = The team searches the hidden room

That version is also correct, but it feels a bit different in style. MSA often prefers verb + subject + object.

Yes. يفتش is an imperfect verb form, which usually corresponds to the present in English, but can also express:

• present action: is searching
• habitual action: searches
• sometimes near future, depending on context

In this sentence, يفتش most naturally means:

• searches
• or is searching

The verb comes from the root connected with searching/inspecting, and here it is 3rd person masculine singular:

• هو يفتش = he searches
• with الفريق = the team searches

Because الفريق is grammatically singular in Arabic.

Even though a team is made of multiple people, the noun itself means the team, which is one unit. So Arabic treats it as singular:

• الفريق يفتش = the team searches

This is similar to English, where the team is searching can also be singular, especially in American English.

الفريق means the team.

A few useful points:

• فريق = team
• الفريق = the team

Because of الـ, the noun is definite.

Depending on context, فريق can mean:

• team
• squad
• group
• party/faction

But here the team is the most natural meaning.

This is a noun + adjective structure:

• الحجرة = the room
• المخفية = the hidden

So together:

• الحجرة المخفية = the hidden room

In Arabic, adjectives usually come after the noun they describe.

So unlike English:

• English: hidden room
• Arabic: room hidden

Because Arabic adjectives must agree with the noun they describe.

The noun الحجرة is:

• feminine
• singular
• definite

So the adjective must also be:

• feminine
• singular
• definite

That is why it is:

• المخفية

Agreement here looks like this:

• الحجرة → feminine singular definite
• المخفية → feminine singular definite

If the noun were masculine, the adjective would be different.

A common clue is the ـة ending, called tāʾ marbūṭa.

So:

• حجرة ends in ـة
• that usually signals a feminine noun

Therefore the adjective must also be feminine:

• الحجرة المخفية

This is one of the most useful patterns for learners to recognize.

المخفية means hidden or concealed.

It comes from the idea of being hidden. In this sentence it describes the room:

• الحجرة المخفية = the hidden room

A learner should notice that this is functioning as an adjective, not as a full verb.

The subject is still الفريق.

Arabic often omits the repeated subject when it is the same as the one before. So:

• يفتش الفريق الحجرة المخفية ويكتشف الدليل = The team searches the hidden room and discovers the clue

The meaning is understood as:

• يفتش الفريق ... ويكتشف الفريق ...

But repeating الفريق would usually be unnecessary.

و means and.

So:

• ويكتشف = and discovers / and is discovering

It joins the two actions:

• يفتش = searches
• ويكتشف = and discovers

This is extremely common in Arabic. The و is attached directly to the next word.

Here, الدليل means the clue or the evidence, depending on context.

The word دليل can have several meanings in Arabic, including:

• clue
• evidence
• proof
• guide

In a detective or mystery context, the clue is the best fit.

So:

• يكتشف الدليل = discovers the clue

Because the Arabic sentence specifically says الدليل, which is the clue, not a clue.

So:

• دليل = a clue / clue
• الدليل = the clue

Arabic uses الـ to mark definiteness, like the in English.

Sometimes translators may choose a clue in looser English, but grammatically the Arabic form here is definitely the clue.

Yes, in full formal Arabic there are case endings, even though they are usually not written in ordinary text.

A fully vocalized version would be something like:

• يُفَتِّشُ الفَرِيقُ الحُجْرَةَ المَخْفِيَّةَ وَيَكْتَشِفُ الدَّلِيلَ

The endings show grammatical roles:

• الفريقُ = subject, so it takes -u
• الحجرةَ = object, so it takes -a
• المخفيةَ = adjective matching the object, so also -a
• الدليلَ = object, so -a

In normal unvocalized writing, these endings are usually omitted.

A helpful pronunciation guide is:

• yufattishu al-farīqu al-ḥujrata al-makhfiyyata wa-yaktashifu ad-dalīla

A few notes:

• ح in حجرة is a strong breathy ḥ, not the ordinary English h
• الدليل is pronounced ad-dalīl, because د is a sun letter, so the l of ال assimilates
• الفريق stays al-farīq, because ف is not a sun letter

If you are reading without case endings in normal MSA pronunciation, learners often say something closer to:

• yufattish al-farīq al-ḥujra al-makhfiyya wa-yaktashif ad-dalīl

No. It is not an iḍāfa.

It is a simple noun + adjective phrase:

• الحجرة = the room
• المخفية = the hidden

An iḍāfa would be something like:

• باب الحجرة = the door of the room
• دليل الفريق = the team’s clue / the clue of the team

A good way to tell the difference is this:

• in noun + adjective, the adjective agrees in definiteness, gender, and number
• here both words have الـ, which is normal for a noun with its adjective

So الحجرة المخفية is definitely noun + adjective, not iḍāfa.