Abans de lliurar els deures, vull tornar a llegir-los.

After abans when Catalan is followed by a verb in the infinitive, it normally uses de:

• abans de sortir = before leaving
• abans de menjar = before eating
• abans de lliurar = before handing in

So abans de + infinitive is the standard pattern.

A useful extra point: if the subject changes, Catalan often uses abans que + subjunctive instead:

• Abans que ell arribi... = Before he arrives...

But in your sentence, the same person is doing both actions, so the infinitive is natural.

Here lliurar means to hand in, to submit, or to turn in.

In a school context:

• lliurar els deures = to hand in the homework
• lliurar un treball = to submit an assignment

You may also see entregar in some contexts, but lliurar is very common and natural for submitting schoolwork or official documents.

Catalan often uses the definite article where English does not.

So although English usually says just homework, Catalan normally says:

• els deures

This is completely normal. The article is not making it especially specific in the English sense; it is just the usual Catalan way to say it.

Because Catalan treats deures as a plural noun in this meaning.

So you get:

• els deures
• fer els deures = to do homework
• lliurar els deures = to hand in the homework

This is one of those places where Catalan and English organize the idea differently:

• English: homework is usually uncountable
• Catalan: deures is plural

That is also why the pronoun later is -los: it refers back to a masculine plural noun.

Catalan often leaves out subject pronouns because the verb ending already shows the person.

• vull = I want

So jo is not necessary unless you want emphasis, contrast, or clarity.

Compare:

• Vull tornar a llegir-los. = I want to read them again.
• Jo vull tornar a llegir-los. = I want to read them again. / As for me, I want to read them again.

Tornar a + infinitive means to do something again.

Examples:

• Tornar a llegir = to read again
• Tornar a veure = to see again
• Tornar a començar = to start again

So:

• vull tornar a llegir-los = I want to read them again

This is a very common Catalan structure. English speakers sometimes expect only a word like again, but Catalan often uses this verbal construction.

Because the expression is fixed as tornar a + infinitive.

So:

• tornar a llegir
• tornar a fer
• tornar a escriure

That a belongs to the expression tornar a and should not be omitted.

It is different from the de in abans de lliurar. In this sentence you have two separate patterns:

• abans de + infinitive
• tornar a + infinitive

-los is a direct object pronoun meaning them, and it refers back to els deures.

Because deures is masculine plural, the correct pronoun is:

• el = him/it (masculine singular)
• la = her/it (feminine singular)
• els = them (masculine plural)
• les = them (feminine plural)

When object pronouns are attached to an infinitive in Catalan, they are written after the verb with a hyphen:

• llegir-los = to read them
• fer-lo = to do it
• veure-les = to see them

So llegir-los literally means to read them.

Catalan often allows more than one position for object pronouns in verb groups.

Your sentence uses one very natural option:

• vull tornar a llegir-los

But you may also hear or see:

• els vull tornar a llegir

Both are acceptable and mean the same thing.

The version with llegir-los keeps the pronoun attached to the infinitive. The version with els vull... moves the pronoun before the conjugated verb (vull). This is often called clitic climbing.

For learners, the version in your sentence is a good clear model because it shows exactly what the pronoun belongs to: llegir-los = read them.

Catalan writes object pronouns attached to infinitives, gerunds, and affirmative imperatives with a hyphen.

So:

• llegir-los
• veure-la
• explicant-ho
• fes-ho

That hyphen is just the normal spelling rule for these attached pronouns.

Yes, to some extent. The sentence as given is very natural:

• Abans de lliurar els deures, vull tornar a llegir-los.

It begins with the time expression Abans de lliurar els deures, then gives the main clause.

You could also say things like:

• Vull tornar a llegir-los abans de lliurar els deures.

That is also correct and natural. The difference is mainly in emphasis and flow, not basic meaning.

The original version foregrounds the before handing in idea first.

Literally it is just read them, but in this context it naturally suggests read them over, read through them again, or check them again before submitting.

Catalan often leaves that nuance to context. The combination of:

• abans de lliurar
• tornar a llegir-los

strongly suggests a final review before handing in the homework.