Necessito diners, perquè avui vull comprar un bitllet.

In Catalan, the verb ending often already tells you who the subject is.
necessito means I need, so you do not have to say jo.

• (jo) necessito = I need
• (tu) necessites = you need
• (ell/ella) necessita = he/she needs

You can add jo for emphasis, but normally it is omitted:

• Necessito diners = I need money
• Jo necessito diners = I need money / I’m the one who needs money

In Catalan, diners is the normal word for money, and it is grammatically plural.

So Catalan says:

• Necessito diners = I need money

Not:

• Necessito diner ✘

This is just something you learn as part of the vocabulary. It works a bit like English words such as scissors or pants, which are plural in form even when they refer to one concept.

This is a very common question.

In your sentence, perquè means because:

• Necessito diners, perquè avui vull comprar un bitllet.
• I need money, because today I want to buy a ticket.

But per què (two words) usually means why or for what:

• Per què necessites diners?
• Why do you need money?

So:

• perquè = because
• per què = why / for what

The accent and the spacing matter.

Because perquè avui vull comprar un bitllet is giving the reason for the first clause.

• Necessito diners = main statement
• perquè avui vull comprar un bitllet = reason/explanation

Using a comma before perquè is very natural here. It separates the main idea from the explanation, much like in English:

• I need money, because today I want to buy a ticket.

This is because vull means I want, and comprar means to buy.

Catalan often uses this structure:

• voler + infinitive
• literally: to want + to buy/do/go/etc.

So:

• vull comprar = I want to buy
• vull menjar = I want to eat
• vull anar = I want to go

This is very similar to English.

Because voler (to want) is an irregular verb.

The I form is:

• vull = I want

Some useful present-tense forms are:

• vull = I want
• vols = you want
• vol = he/she wants
• volem = we want
• voleu = you all want
• volen = they want

So avui vull comprar simply means today I want to buy.

Un is the indefinite article, meaning a or an.

• un bitllet = a ticket

In Catalan, as in English, you usually need an article with a singular countable noun when you mean one unspecified item.

So:

• vull comprar un bitllet = I want to buy a ticket

If you said just comprar bitllet, it would sound incomplete or unnatural in standard Catalan.

Bitllet usually means ticket in contexts like transport, entry, travel, and similar situations.

Examples:

• un bitllet de tren = a train ticket
• un bitllet d’avió = a plane ticket
• un bitllet d’entrada = an admission ticket

Depending on context, bitllet can also mean a banknote in some uses, but in your sentence, with comprar un bitllet, the meaning is clearly ticket.

The ll in Catalan is a special sound. In many varieties, it sounds like the lli in million for many English speakers, though the match is not perfect.

A rough guide:

• bitllet ≈ beet-lyet / bit-yet, depending on accent

A few pronunciation notes:

• bi- sounds like bee or a short bi
• -tllet contains the ll sound
• the final -et is short

Also, pronunciation can vary somewhat by dialect, so you may hear slightly different realizations of ll.

The accent shows where the stress goes.

perquè is stressed on the last part:

• per-QUÈ

The accent on è marks an open e sound and helps distinguish it from other similar spellings.

So the accent is useful both for pronunciation and for telling it apart from forms like per què.

Avui means today. It is an adverb of time.

In your sentence:

• perquè avui vull comprar un bitllet
• because today I want to buy a ticket

Catalan is fairly flexible with adverbs like avui, but this position is very natural. You could also see:

• Avui vull comprar un bitllet.
• Vull comprar un bitllet avui.

All are possible, though the emphasis may change slightly.

Yes, but it would mean something slightly different.

• Necessito diners = I need money in a general sense
• Necessito els diners = I need the money / I need that money

So the version without the article is more general and fits the English sentence I need money best.

Not completely. Catalan word order is often similar to English, but it can be more flexible.

Your sentence:

• Necessito diners, perquè avui vull comprar un bitllet.

is a very natural, standard order.

You may also find variations such as:

• Perquè avui vull comprar un bitllet, necessito diners.

This changes the emphasis, but the meaning is basically the same. The original version is probably the most neutral and straightforward for learners.