Piqûre de rappel
Present continuous: I am reading an interesting book at the moment.
Past continuous: I was reading a book when the phone rang.
Present perfect continuous: I have been reading this book all afternoon.
Past perfect continuous: I had finished reading my book when he arrived.
Notez que tous les continuous tenses traduisent une activité et, de ce fait, se construisent avec un verbe se terminant en –ing.