In French, to describe doing two things at once, or how you do something, you can use a form called the 'gérondif'. It often translates to 'while doing' or 'by doing' something in English.

To form the gérondif, you use the word 'en', followed by the verb stem from the 'nous' form in the present tense, and add the ending 'A N T'. For example, the 'nous' form of 'parler' is 'parlons'. So, the gérondif is 'en parlant'.

One main use of the gérondif is to talk about two actions happening at the same time, performed by the same person. For instance, 'Il travaille en écoutant de la musique' means 'He works while listening to music'.