الساق رطبة.

A careful MSA pronunciation is as-sāqu raṭbatun.

A few details:

• الساق is written with الـ, but it is pronounced as-sāq(u), not al-sāq(u), because س is a sun letter.
• رطبة is pronounced raṭbatun in full case-ending pronunciation, but at the end of a sentence it is often heard as raṭbah.
• ط is an emphatic t sound.
• ق is the qāf sound, a deep back q.

So a beginner-friendly pronunciation is roughly: as-saaq raṭbah.

Because س is one of the sun letters in Arabic.

When الـ comes before a sun letter, the l sound assimilates to the next consonant. So:

• written: الساق
• pronounced: as-sāq

This is a very common pattern in Arabic. For example:

• الشمس → ash-shams
• السماء → as-samā’

In Arabic, the verb to be is usually not expressed in the present tense in simple sentences like this.

So:

• الساق رطبة literally looks like the leg wet
• but it means the leg is wet/moist

This kind of sentence is called a nominal sentence in Arabic:

• الساق = the subject
• رطبة = the predicate

If you wanted was, then Arabic would use a verb, such as كانت.

Because الساق is a feminine noun in Arabic, and adjectives must agree with the noun they describe or refer to.

So:

• masculine: رطب
• feminine: رطبة

Since الساق is feminine singular, the predicate adjective must also be feminine singular:

• الساق رطبة

This agreement is very important in Arabic.

In Arabic, adjectives normally come after the noun.

Also, in this sentence, رطبة is not just an adjective inside a noun phrase; it is the predicate of the whole sentence.

So the structure is:

• الساق = the leg
• رطبة = wet/moist

Together: The leg is wet.

This word order is normal in Arabic.

Because رطبة here is the predicate of the sentence, and predicates in this kind of sentence are usually indefinite.

So:

• الساق رطبة = The leg is wet
• الساق الرطبة = the wet leg

That is a very important difference.

So if both words have الـ, it is no longer a full sentence in the same way; it becomes a noun phrase.

In fully vocalized MSA, the sentence is:

الساقُ رَطْبَةٌ

That is:

• الساقُ = nominative with -u
• رَطْبَةٌ = nominative indefinite with -un

This is because:

• الساقُ is the subject (مبتدأ)
• رطبةٌ is the predicate (خبر)

In careful formal reading, those endings may be pronounced. In normal pause or less formal pronunciation, they are often reduced or not fully heard.

It is an adjective in form, but in this sentence it functions as the predicate.

So grammatically:

• رطبة is an adjective
• but syntactically it is the khabar of the sentence

That means it is telling you something about الساق:

• what the leg is like
• namely, that it is wet/moist

So both statements are true:

• it is an adjective
• it is the predicate of the nominal sentence

Yes. Depending on context, ساق can also mean things like stem, stalk, or trunk.

So the sentence could have different translations in different contexts, for example:

• The leg is wet
• The stalk is wet

The grammar stays the same either way. Context tells you which meaning is intended.

You would say:

الساق الرطبة

Here, both words are definite:

• الساق = the leg
• الرطبة = the wet

Together, that means the wet leg.

Compare:

• الساق رطبة = The leg is wet
• الساق الرطبة = the wet leg

This is one of the most useful contrasts for beginners to learn.