Why is there an 's' on lu?

Why is there an 's' on lu?

In statement: il les a tous lus (he has read all of them) why is there an s on lus? It is: il a lu so I presume it's got something to do with tous but I'd like an explanation if possible.
Asked 2 years ago
les is a direct object and when it comes before the verb in the passé composé the veb agrees. Thus: Il a lu les livres (no agreement) Les livres, il a tous lus. (direct object - les livres before the verb)
Clear. Thanks.
AurélieKwiziq language super star
Bonjour Renate ! Here is a link to our lesson on that special agreement rule: Special cases when the past participle agrees (in number & gender) when used with 'avoir' in Le Passé Composé À bientôt !
Helpful. Thanks

Why is there an 's' on lu?

In statement: il les a tous lus (he has read all of them) why is there an s on lus? It is: il a lu so I presume it's got something to do with tous but I'd like an explanation if possible.

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