Adjoindre belong to the 3rd group.
Adjoindre is conjugated the same way that verbs that end in : -ndre
Adjoindre is conjugated with auxiliary avoir.
Adjoindre verb is
direct transitive.
French verb adjoindre can be conjugated in the reflexive form: S'adjoindre Adjoindre verb is a direct transitive verb, so passive voice can be used.
Adjoindre is a french third group verb. So, this verb is irregular and do not follow a regular conjugation pattern like first or second group verbs. Follow this link to see all the endings of the conjugation of most of the third group verbs : conjugation rules and endings for the second group verbs.
Adjoindre verb is conjugated in female form and in reflexive form. Be careful, the past participle of compound tenses must agree with the subject.
ADJOINDRE : v. tr. Joindre une ou plusieurs personnes à une ou plusieurs autres pour exécuter une chose. Il ne pouvait suffire seul à un emploi si fatigant, on fut obligé de lui adjoindre quelqu'un. Il s'est adjoint un tel.