Bonjour David,

‘Assis’ is an adjective as Maarten mentioned. It is also now called ‘adjectif participe’ or adjectival form of the verb as it is derived from a verb. See paragraph on past participle as an adjective.

C’est le fauteuil sur lequel je suis assis= it is the armchair on which I am sitting

C’est le fauteuil sur lequel je reste assis toute la journée = it is the armchair on which I stay sitting down all day

Les animaux sont perdus dans le nouvel enclos = the animals are lost in the new enclosure

Les animaux semblent perdus dans le nouvel enclos = the animals seem lost in the new enclosure

 

Pattern for Voix Passive:

- The object becomes the subject

- We use the auxiliary être conjugated to one of the simple tenses, followed by the past participle of the verb

- We use the preposition par to introduce the complement.

 

I hope this is helpful.

Bonne journée!