No estojo dela, sempre há uma régua e duas canetas azuis.

No is a contraction of em + o = no, meaning in the.

In this sentence, the full structure is:

• em = in
• o estojo = the pencil case
• dela = of hers / her

So:

• no estojo dela = in her pencil case

Even though English says her pencil case, Portuguese often uses a structure like the pencil case of hers.

Portuguese can express possession in more than one way.

Here, dela means of her / hers, so:

• o estojo dela = her pencil case

This form is very common because it is clear and avoids ambiguity.

If you said seu estojo, it could mean:

• her pencil case
• his pencil case
• sometimes even your pencil case depending on context and region

So dela is often preferred when the speaker wants to make it unmistakably clear that it belongs to her.

Há here means there is or there are.

So:

• há uma régua = there is a ruler
• há uma régua e duas canetas azuis = there is a ruler and two blue pens / there are a ruler and two blue pens

In Portuguese, haver used in this existential sense does not change for singular or plural. So even if several things are mentioned, you still use há:

• Há um livro. = There is a book.
• Há dois livros. = There are two books.

This is different from English, where there is and there are change.

Because existential haver is impersonal in Portuguese.

That means it stays in the third-person singular form:

• há = there is / there are

So Portuguese says:

• Há uma régua e duas canetas.

not a plural form of haver.

This is standard grammar and one of the most important things to remember about haver in this meaning.

Yes, in everyday Brazilian Portuguese, many speakers would naturally say:

• No estojo dela, sempre tem uma régua e duas canetas azuis.

This is very common in speech.

However:

• há is more formal or neutral in careful writing
• tem is very common in spoken Brazilian Portuguese

So both are possible, but há is often taught first because it is the standard grammatical form for there is/there are.

Sempre means always, and in Portuguese adverbs like this often come before the verb:

• sempre há = there is always / there are always

This word order is very natural in Portuguese.

You may also see adverbs in other positions depending on emphasis, but sempre há is straightforward and common.

This is about number and agreement.

• uma régua = one ruler
• duas canetas azuis = two blue pens

Portuguese nouns and related words often change form depending on singular or plural.

Here:

• uma = feminine singular
• duas = feminine plural
• canetas = plural of caneta
• azuis = plural form of azul

Because canetas is plural, the adjective also becomes plural:

• caneta azul = blue pen
• canetas azuis = blue pens

In Portuguese, adjectives usually come after the noun.

So:

• canetas azuis = blue pens
• literally: pens blue

This is the normal position in most everyday cases.

Sometimes adjectives can come before the noun, but that often changes the tone, style, or emphasis. For a basic descriptive phrase like this, noun + adjective is the standard pattern.

Because adjectives must agree with the noun they describe.

• caneta is singular, so: caneta azul
• canetas is plural, so: canetas azuis

The adjective azul has these forms:

• singular: azul
• plural: azuis

Not all adjectives form the plural in exactly the same way, so this is a useful one to memorize as a pattern.

Estojo is a masculine noun.

That is why it appears with o:

• o estojo = the pencil case

And when combined with em, it becomes:

• em + o = no

So:

• no estojo = in the pencil case

In Brazilian Portuguese, estojo commonly refers to a pencil case or pen case.

The phrase No estojo dela has been placed at the beginning of the sentence as a setting or location phrase: In her pencil case.

In Portuguese, it is common to use a comma after this kind of introductory phrase:

• No estojo dela, sempre há...

English often leaves out the comma in short introductory phrases, though it can sometimes be used depending on style.

So the comma here helps separate the location phrase from the rest of the sentence, but it is not the most difficult part grammatically.

Yes, régua is feminine.

You can tell here because it uses:

• uma régua = a ruler

If it were masculine, it would use um instead of uma.

Also notice the accent in régua. You should learn the noun together with its article:

• a régua = the ruler

That makes it easier to remember the gender.

Yes, it sounds natural and correct.

It is a clear, standard sentence. A Brazilian speaker might also say it in slightly different ways, such as:

• No estojo dela, sempre tem uma régua e duas canetas azuis.
• Ela sempre tem uma régua e duas canetas azuis no estojo.

All of these are natural, but the original sentence is perfectly good Portuguese and nicely illustrates:

• contraction: no
• possession with dela
• existential há
• adjective agreement: canetas azuis