الزجاجة في سلة النزهة.

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

So الزجاجة في سلة النزهة literally looks like the bottle in the picnic basket, but it naturally means The bottle is in the picnic basket.

In Modern Standard Arabic, this is normal in the present tense. If you wanted a past or future meaning, then Arabic would use an actual verb.

Yes. This is a very common kind of Arabic sentence called a nominal sentence.

Its two main parts are:

• الزجاجة — the topic / subject
• في سلة النزهة — the comment / predicate

So the structure is basically:

• the bottle
  • in the picnic basket

That is enough to make a full sentence in Arabic.

في is the preposition in.

Like English prepositions, it introduces a prepositional phrase. In Arabic grammar, a noun after a preposition is put in the genitive case.

So in this sentence:

• في سلة = in a/the basket

The word سلة is grammatically genitive because it comes after في.

Because this is an iḍāfa construction, often called a construct phrase.

سلة النزهة literally means basket of the picnic. In English, that becomes the picnic basket.

In an iḍāfa:

• the first noun usually does not take ال
• the second noun shows whether the whole phrase is definite or not

So:

• سلة نزهة = a picnic basket
• سلة النزهة = the picnic basket

That is why سلة does not have ال here.

Because in an iḍāfa, the definiteness of the whole phrase comes from the last noun.

Since النزهة has ال, it is definite, and that makes the whole phrase سلة النزهة definite too.

So even without ال, سلة here is understood as part of the definite phrase the picnic basket.

A fully vocalized version would be:

الزجاجةُ في سَلَّةِ النُّزْهَةِ

These endings show:

• الزجاجةُ — nominative, because it is the subject/topic of the nominal sentence
• سَلَّةِ — genitive, because it comes after في
• النُّزْهَةِ — genitive, because it is the second noun in the iḍāfa

In normal everyday writing, these short vowels are usually omitted.

In both words, the ل of ال is not pronounced clearly, because ز and ن are sun letters.

So:

• الزجاجة is pronounced roughly az-zujāja
• النزهة is pronounced roughly an-nuzha

This is called sun-letter assimilation.

Yes. The ending ة is called tāʾ marbūṭa, and it often marks a noun as feminine.

So سلة is a feminine noun.

That does not necessarily mean the object itself is biologically female; it just means the word is grammatically feminine. Arabic nouns have grammatical gender, and سلة happens to be feminine.

That is a very common question.

The ة at the end of a word is usually pronounced like -a or -ah when the word stands on its own.

But it is often pronounced as t when the word is in certain grammatical situations, especially in an iḍāfa.

So:

• by itself: سلة ≈ salla / sallah
• in سلة النزهة: the t is heard, roughly sallat an-nuzha in connected speech

That is one reason learners often notice the ending changing in pronunciation.

Because the nouns here are definite, not indefinite.

• الزجاجة is definite because it has ال
• سلة النزهة is definite because it is an iḍāfa whose second noun, النزهة, is definite

Tanwīn is generally used with indefinite nouns, so it does not appear here.

Yes, Arabic can sometimes change word order for emphasis or style, but the given order is the most neutral and straightforward.

الزجاجة في سلة النزهة starts with the thing being talked about, the bottle, and then says where it is.

For a learner, this is the best order to recognize first:

• subject/topic
  • prepositional phrase

A very useful learner-friendly breakdown is:

• الزجاجة = the bottle
• في = in
• سلة النزهة = the picnic basket

Or grammatically:

• الزجاجة = subject/topic
• في سلة النزهة = predicate

Seeing it in chunks like this makes Arabic word groups much easier to read.