Learn Portuguese (Portugal): Vocês estão cansados no trabalho?

The verb estar is used for temporary states and conditions. Because being tired (cansados) is a temporary feeling rather than a permanent trait, we use estão.

Does Vocês always use the 'they' form of the verb?

Yes! Even though Vocês means 'you' (plural), it always pairs with the third-person plural verb conjugation. This is the exact same verb form used for eles and elas (they).

Why does the word for tired (cansados) end in '-os'?

Adjectives in Portuguese must match the gender and number of the people they describe. The -s makes it plural to match Vocês. The masculine -o is used for an all-male group or a mixed group. If you were speaking to a group of only women, it would change to cansadas.

Why is 'at work' translated as no trabalho?

The word no is a combination of the preposition em (in/at) and the masculine word for 'the', o. Unlike English, which just says 'at work', Portuguese usually includes 'the' and says 'at the work' (em + o = no).