Learn Portuguese (Portugal): Que bem que vocês dançam!

The structure Que followed by an adverb or adjective, and then another que, is a very common way to make an exclamation in Portuguese. It translates to 'How well...!' or 'How beautiful...!'. The second que is optional and just adds spoken emphasis. You could also just say Que bem vocês dançam! with the exact same meaning.

English uses 'How' for this exclamation. Could I use Como instead of the first Que here?

Not in this exact structure. While como means 'how' in questions, exclamations expressing 'How well!' or 'How beautiful!' usually start with Que in Portuguese. If you really want to use como, you have to change the word order entirely, such as Como vocês dançam bem!

Why does the sentence use bem instead of bom?

Bem means 'well' and is an adverb used to describe an action, which in this case is the verb dançam (dance). Bom means 'good' and is an adjective used to describe nouns (like a good dancer). Since we are describing how they perform the action, we must use bem.

Since vocês means 'you' (plural), why does the verb dançam use the 'they' ending?