هذا المكان ليس مشمسا فقط، بل فيه ظل أيضا.

In Arabic, when a noun comes after a demonstrative like هذا (this), the noun is normally definite, so it takes ال.

So:

• هذا المكان = this place
• literally, it looks like this the-place, but that is just normal Arabic structure

If you said هذا مكان, it would usually sound less standard in careful Modern Standard Arabic, because the noun after هذا is expected to be definite.

ليس is the normal way to negate a nominal sentence in Arabic.

The positive sentence would be:

• هذا المكان مشمس = This place is sunny

To negate that, Arabic uses:

• هذا المكان ليس مشمسًا = This place is not sunny

So ليس is functioning like is not here.

Because مشمسًا is the predicate of ليس.

In traditional grammar:

• ليس has a subject
• and a predicate
• its predicate is usually accusative (منصوب)

So in full vocalization, you get:

• مُشْمِسًا

That final -an sound is the accusative tanwīn.

Also, it is indefinite here, so it does not take ال.

فقط means only or just.

Arabic often places فقط after the word or phrase it limits. So:

• مشمسًا فقط = sunny only / only sunny

That is why the sentence means:

• not only sunny

You may also see:

• ليس فقط مشمسًا

That is also possible. The sentence you have is just another natural word order.

Here بل introduces a correction or addition after a negative statement.

In this sentence, it works like:

• but rather
• or, in smoother English, the second half of not only … but also …

So the pattern is:

• ليس ... فقط، بل ... أيضًا
• not only ..., but also ...

بل is not exactly the same as لكن.
لكن is more like but, while بل often means rather / instead / but rather, especially after something negative.

Arabic often expresses existence without a separate verb like there is.

So:

• فيه ظل
• literally: in it [there is] shade

This is a very common Arabic pattern:

• في البيت رجل = There is a man in the house
• عندي كتاب = I have a book / literally At me is a book

So فيه ظل is a natural way to say that the place contains shade or has shade.

Because Arabic prepositions attach directly to pronoun suffixes.

Here:

• في = in
• ه = him / it

Together:

• فيه = in it

The ه refers back to المكان.

This is a very common pattern in Arabic:

• فيه = in it
• عليه = on it / on him
• له = for him / it has
• عندها = at her / she has

Because Arabic often uses an indefinite noun when introducing something in an existential sentence.

So:

• فيه ظل = there is shade in it / it has shade

Using ظل without ال makes it sound like you are mentioning the existence of shade in general.

If you said فيه الظل, that would sound more like the shade is in it, which is more specific and usually less natural here.

أيضًا means also, too, or as well.

So:

• بل فيه ظل أيضًا = but it also has shade / but there is shade as well

Arabic often places أيضًا near the end of the clause. That is a very normal position.

It can sometimes appear in other places too, but final position is common and natural.

Yes, in gender and number it matches the noun it describes.

Here:

• المكان is masculine singular
• so the predicate/adjective is also masculine singular: مُشْمِس

In the sentence it appears as مُشْمِسًا because of the grammar of ليس, but its basic form is still masculine singular.

If the noun were feminine, the adjective would change too. For example:

• هذه الغرفة ليست مشمسةً = This room is not sunny

Yes, Arabic allows some flexibility.

For example, these are also natural:

• ليس هذا المكان مشمسًا فقط، بل فيه ظل أيضًا
• هذا المكان ليس فقط مشمسًا، بل فيه ظل أيضًا

These all express basically the same not only … but also … idea.

But if you say:

• هذا المكان مشمس، وفيه ظل أيضًا

that means:

• This place is sunny, and it also has shade

That version is fine, but it loses the stronger not only … but also … emphasis.

With full vocalization, it would be:

• هٰذَا الْمَكَانُ لَيْسَ مُشْمِسًا فَقَطْ، بَلْ فِيهِ ظِلٌّ أَيْضًا

A helpful transliteration is:

• hādhā al-makānu laysa mushmisan faqaṭ, bal fīhi ẓillun ayḍan

A few pronunciation notes:

• هذا = hādhā
• مُشْمِسًا = mushmisan
• فقط = faqaṭ
• فيه = fīhi
• ظل begins with ظ, an emphatic z-like sound
• أيضًا = ayḍan

In everyday reading, final case endings are often not fully pronounced, but it is still useful to know them in Modern Standard Arabic.