La professora vol explicar la resposta abans de l'examen.

Because both professora and resposta are feminine singular nouns, so they take the feminine singular definite article la.

• la professora = the teacher (female)
• la resposta = the answer

Catalan, like Spanish and French, marks grammatical gender on articles. In this sentence, English and Catalan line up quite neatly: the teacher / the answer.

Yes. Professora is the feminine form, so it refers to a female teacher.

• la professora = the female teacher
• el professor = the male teacher

A learner may notice that many Catalan nouns referring to people change form according to gender, often with -a for feminine and -or or another form for masculine, though not every noun follows a simple pattern.

Vol is the 3rd person singular present tense of voler, which means to want.

So:

• jo vull = I want
• tu vols = you want
• ell/ella vol = he/she wants

In this sentence, la professora vol... means the teacher wants...

Because after voler in Catalan, you normally use the bare infinitive directly, without an extra word like a.

So Catalan says:

• vol explicar = wants to explain
• vull menjar = I want to eat
• volen sortir = they want to go out

English uses to after want, but Catalan does not add an equivalent word here.

Because la resposta refers to a specific answer, not just any answer.

• la resposta = the answer
• una resposta = an answer

So the sentence suggests that the teacher wants to explain the particular answer already understood from the context.

Because abans de is the normal Catalan expression for before when it is followed by a noun or an infinitive.

Examples:

• abans de l'examen = before the exam
• abans de classe = before class
• abans de sortir = before leaving

So here, abans de works as a fixed structure.

Because the masculine singular article el becomes l' before a word beginning with a vowel or silent h.

• el llibre = the book
• l'examen = the exam
• l'hotel = the hotel

So el examen is not correct in standard Catalan; it must be l'examen.

Because examen begins with a vowel, so the article is already shortened to l'.

Compare these:

• de + el llibre → del llibre
• de + l'examen → de l'examen

So del is used when the article is el, but here the article is l', not el.

It can mean both, depending on context.

• In a school or test context, resposta often means answer
• In a conversational context, it can mean response

In this sentence, because of l'examen, the most natural interpretation is answer.

The word order here is very natural, but Catalan is fairly flexible.

This version is standard:

• La professora vol explicar la resposta abans de l'examen.

You could also say:

• Abans de l'examen, la professora vol explicar la resposta.

Both are correct. The second version emphasizes the time expression before the exam a little more.

Yes, Catalan often allows the subject to be omitted if it is clear from context, because the verb ending already gives information about the subject.

So:

• Vol explicar la resposta abans de l'examen.

can be understood as He/She wants to explain the answer before the exam, depending on context.

However, including La professora makes the subject completely explicit, which is often helpful and natural.

No. The fact that it starts with a vowel only affects the shape of the article (l' instead of el). Its gender is a separate matter.

• examen is masculine
• so its basic article is el
• but before a vowel, el becomes l'

That is why we get l'examen, not because the noun is feminine or special in meaning, but because of the sound at the beginning of the word.