In French, to link two future actions with 'quand', meaning 'when', you must use the 'futur simple' tense in both parts of the sentence. This is a key difference from English, where we often use the present tense after 'when' for a future event.

For instance, to say 'When you arrive, we will have dinner', you say 'Quand tu arriveras, on dînera'. Notice that both 'arriveras' and 'dînera' are in the futur simple, as both actions will happen in the future.

Here's another example using 'je': 'Quand j'aurai le temps, je t'appellerai'. This means 'When I have the time, I will call you'. Again, both verbs, 'aurai' and 'appellerai', are in the futur simple.