Para a prova, a professora pede uma caneta e dois lápis.

It means for the test/exam.

• para = for
• a prova = the test / the exam

So Para a prova sets the context: this is what is needed for the test.

In Portuguese, prova often means a school test/exam, although in other contexts it can also mean proof.

The comma is there because Para a prova has been moved to the front of the sentence.

Portuguese often uses a comma after an introductory phrase like this, especially when it gives context such as time, purpose, or situation.

So:

• Para a prova, a professora pede... = fronted for emphasis or setup
• A professora pede ... para a prova. = same basic meaning, more neutral order

Both are natural.

Portuguese very often uses the definite article before a noun like professora when talking about a specific person already understood in context.

So:

• a professora = the teacher

Even when English would often just say the teacher or sometimes omit an article in certain expressions, Portuguese usually keeps it here.

In this sentence, a professora is the subject: the teacher is the one making the request.

Pede is the third-person singular present form of the verb pedir.

• pedir = to ask for, to request
• pede = asks for / requests

So:

• a professora pede = the teacher asks for / requests

Depending on context, it can sound like:

• asks students to bring
• requests
• sometimes even requires, if the situation is more formal

But the most direct meaning is asks for.

Because the subject is singular:

• a professora = the teacher = one person

So the verb must also be singular:

• a professora pede

If the subject were plural, the verb would change:

• as professoras pedem = the teachers ask for

Because the sentence is listing quantities:

• uma caneta = one pen
• dois lápis = two pencils

So the noun changes according to quantity:

• singular item: uma caneta
• plural item: dois lápis

This is just like English in meaning, although Portuguese marks gender too.

Because lápis is a masculine noun.

In Portuguese, two changes for gender:

• dois = masculine
• duas = feminine

So:

• dois lápis because lápis is masculine
• duas canetas because caneta is feminine

Even though a pencil is not biologically male, grammatical gender still applies.

You usually learn a noun’s gender together with its article:

• a caneta = feminine
• o lápis = masculine

That is the safest habit in Portuguese: memorize nouns with o / a.

Here that affects the sentence:

• uma caneta because caneta is feminine
• dois lápis because lápis is masculine

Because lápis is one of those Portuguese nouns whose singular and plural have the same form.

So:

• um lápis = one pencil
• dois lápis = two pencils

You understand whether it is singular or plural from:

• the article or number word before it
• the rest of the sentence

This is similar to some English words that do not change much in plural form.

No. Prova can mean different things depending on context.

Common meanings include:

• test / exam
• proof
• sometimes competition event in sports

In this sentence, because of a professora and school-related context, prova clearly means test/exam.

Yes. That is also correct and natural.

Compare:

• Para a prova, a professora pede uma caneta e dois lápis.
• A professora pede uma caneta e dois lápis para a prova.

The difference is mainly emphasis:

• putting Para a prova first highlights the context right away
• putting it at the end gives a more straightforward statement

Yes. In this sentence, uma caneta e dois lápis are the direct objects of pede.

So Portuguese says:

• pedir uma caneta
• pedir dois lápis

There is no extra preposition before those objects.

That is why the structure is:

• a professora pede uma caneta e dois lápis

not something like pede por in this case.

By grammar alone, it literally means the teacher asks for a pen and two pencils for the test.

In real context, it usually means the teacher is telling students what they need to have or bring for the test.

So in natural English, depending on context, you might understand it as:

• For the test, the teacher asks for a pen and two pencils.
• For the test, the teacher asks students to bring a pen and two pencils.

The Portuguese sentence itself does not explicitly mention students, but that idea is often understood from context.