A empresa cujo site ficou fora do ar vai enviar outro link amanhã.

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Breakdown of A empresa cujo site ficou fora do ar vai enviar outro link amanhã.

• ir: to go (future auxiliary)
• enviar: to send
• outro: another

Questions & Answers about A empresa cujo site ficou fora do ar vai enviar outro link amanhã.

What does cujo mean here, and why is it used?

Cujo means whose.

In A empresa cujo site ficou fora do ar..., it connects a empresa and site:

• a empresa = the company
• cujo site = whose website

So the sentence is literally structured like:

• The company whose website went down...

Portuguese uses cujo / cuja / cujos / cujas for this kind of relationship of possession. It is more formal and more precise than trying to use que.

Why is it cujo site and not cuja site?

Because cujo agrees with the thing that comes after it, not with the owner.

Here:

• owner: a empresa → feminine
• possessed thing: site → masculine singular

Since site is masculine singular, you use cujo.

Compare:

• a empresa cujo site... = the company whose website...
• a empresa cuja página... = the company whose page...
• as empresas cujos sites... = the companies whose websites...
• as empresas cujas páginas... = the companies whose pages...

So the form depends on the noun after cujo.