Nous nous sommes adjoints des partenaires majeurs.

I wonder if it should be “adjoint”; the second nous seems to be the indirect complement, which means that the participle should not be inflected.

I think my understanding is correct, let me offer it here for what it’s worth! Verbs which require être in the passe composé must accord with the number and gender of the subject. The verb s’adjoindre is pronominal/reflexive and hence requires être.

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I’m almost convinced, but… :slight_smile:

My grammar gives the examples “M. et Mme Mollet se sont téléphoné (se sont parlé)”, “Elle s’est lavé les mains”, and “Elle s’est cassé le bras”, where se is the indirect object and the participle is thus not inflected. Unfortunately, it does not have an example using nous nous.

See also this discussion:é-demandés.1278856/.

It turns out I was right; see the discussion on Tatoeba: Nous nous sommes adjoint des partenaires majeurs. - French example sentence - Tatoeba.

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