Je dois/ nous devons
I must/ we must (have to)
J’ai dû/ nous avons dû
I had to/ we had to
Je devais/ nous devions
I had to/ we had to
Je devrai/ nous devrons
I will have to/ we will have to
Je devrais/ nous devrions
I should/ we should
J’avais dû/ nous avions dû
I had had to/ we had had to