Learn French: Nous allons à une fête ce soir. - We are going to a party tonight.

It means both! French does not have a separate '-ing' tense like English does. The present tense nous allons translates to both 'we go' and 'we are going'. In this sentence, 'we are going' makes the most sense in English.

Why does it sound like there is a 'z' when saying nous allons?

This is because of a pronunciation rule called liaison. The word nous ends in a normally silent 's', but because the next word allons starts with a vowel, that 's' is pronounced as a 'z' sound to smoothly connect the two words.

Why do we use à before une fête?

The verb aller (to go) is almost always followed by the preposition à when you are going to a destination or an event. Here, à une fête simply means 'to a party'.

How does ce soir translate to 'tonight'?

Literally, ce soir means 'this evening' (ce meaning 'this', and soir meaning 'evening'). French does not have a single combined word for 'tonight', so you will always use ce soir to express this idea.