Conjugation of the verb seoir
Active 
Indicative 
Present
il sied / elle sied
ils siéent / elles siéent
Imperfect
il seyait / elle seyait
ils seyaient / elles seyaient
Simple past
Future
il siéra / elle siéra
ils siéront / elles siéront
Present perfect
Pluperfect
Past anterior
Future perfect
Subjunctive 
Present
qu'il siée / qu'elle siée
qu'ils siéent / qu'elles siéent
Imperfect
Past
Pluperfect
Conditional 
Present
il siérait / elle siérait
ils siéraient / elles siéraient
Past 1
Past 2
Imperative 
Present
Past
Participle 
Present
seyant / séant (vx)
Past
Infinitive 
Present
seoir