Cal adjuntar el currículum; si no, perdràs l'oportunitat.

Cal is an impersonal verb form, from caldre, and it means something like it is necessary, one must, or it’s required.

In this sentence, cal adjuntar el currículum means that attaching the CV is necessary, without saying exactly who must do it. That is very common in Catalan for instructions, rules, and formal notices.

So:

• Cal adjuntar... = It is necessary to attach...
• Has d’adjuntar... = You have to attach...

The first version sounds more general and impersonal.

After cal, Catalan often uses an infinitive to express what is necessary.

So the pattern is:

• cal + infinitive

Examples:

• Cal esperar. = It is necessary to wait.
• Cal signar el document. = The document must be signed / It is necessary to sign the document.
• Cal adjuntar el currículum.

This works a lot like English it is necessary to + verb.

Catalan often uses the definite article more regularly than English does, especially with specific nouns in formal instructions.

So adjuntar el currículum is the natural way to say attach the CV/résumé.

Using the article here does not necessarily make it sound more specific than in English; it is simply the normal Catalan structure.

Compare:

• Porta el passaport. = Bring your passport / the passport.
• Adjunta el currículum. = Attach the CV.

Yes. In this context, currículum means CV/résumé.

Very often you may also see:

• currículum vitae
• CV

In everyday use, currículum is extremely common and natural.

This is a very common question.

In your sentence, si no is correct because it means if not:

• si no, perdràs l'oportunitat = if not, you will lose the opportunity

By contrast, sinó is a different word meaning but rather, except, or sometimes but instead.

Compare:

• Vine ara; si no, serà massa tard. = Come now; if not, it will be too late.
• No vull te, sinó cafè. = I don’t want tea, but rather coffee.

So here it must be si no because it introduces a condition: if not.

Perdràs is the future tense, second person singular (you will lose), from the verb perdre (to lose).

Breakdown:

• infinitive: perdre
• future stem: perdr-
• ending for tu: -às
• result: perdràs

Examples of the same tense:

• jo perdré = I will lose
• tu perdràs = you will lose
• ell/ella perdrà = he/she will lose

Catalan usually does not need subject pronouns because the verb ending already shows the subject.

So perdràs already means you will lose, and adding tu is usually unnecessary unless you want emphasis or contrast.

Compare:

• Perdràs l'oportunitat. = You will lose the opportunity.
• Tu perdràs l'oportunitat, no jo. = You will lose the opportunity, not me.

This is similar to Spanish and unlike English, which normally requires the subject pronoun.

Because la becomes l' before a vowel sound.

The full article is la, since oportunitat is feminine:

• la oportunitat would not be used
• it becomes l'oportunitat

This is called elision.

More examples:

• l'empresa from la empresa
• l'escola from la escola
• l'oferta from la oferta

The same happens with el:

• l'amic from el amic

The semicolon links two closely related parts:

• Cal adjuntar el currículum
• si no, perdràs l'oportunitat

It works a bit like a strong comma or a softer full stop. It helps separate the instruction from the consequence.

You could also see similar sentences written with:

• a comma
• a dash
• a full stop

But the semicolon is perfectly natural in formal writing.

Yes, and the nuance changes slightly.

• Cal adjuntar el currículum.
  Impersonal, formal, general requirement.

• Has d’adjuntar el currículum.
  Directly addressing one person: you have to attach the CV.

• S’ha d’adjuntar el currículum.
  Also impersonal, often used in formal instructions: the CV must be attached / one must attach the CV.

All three are possible, but cal is especially common in concise formal instructions.

Here, cal is followed by an infinitive clause: adjuntar el currículum. In that structure, cal stays in the singular impersonal form.

So:

• Cal adjuntar el currículum.
• Cal portar dues fotos.
• Cal omplir tots els camps.

However, with a noun phrase instead of an infinitive, caldre can sometimes agree in the plural:

• Cal una signatura.
• Calen dues signatures.

So in your sentence, the singular cal is normal because the main structure is cal + infinitive.

Yes, adjuntar is very natural in administrative, professional, and digital contexts. It is commonly used for attaching documents to forms, emails, or applications.

Other possible verbs depend on context:

• adjuntar = to attach
• afegir = to add
• incloure = to include
• enviar = to send

But for a CV attached to an application or file submission, adjuntar is exactly the right choice.

A less formal version might be:

• Has d’adjuntar el currículum; si no, perdràs l’oportunitat.
• Adjunta el currículum; si no, perdràs l’oportunitat.

Differences:

• Cal adjuntar... sounds more neutral and institutional.
• Has d’adjuntar... sounds more direct.
• Adjunta... is the imperative, so it sounds like a direct command.

The original version is especially typical of notices, instructions, or application requirements.