I wasn't confused about this till I read the response to why is there the "de" between"c'est" and "perdre". In your response you say if "adjective or past participle in-ed" comes after être, but there is no adjective or past participle after "c'est", so why the "de"?
us
Thank you for your contribution, Maarten !
- être + adjective or past participle in-ed + de + verb
- être + de + verb