| A | B |
|---|
| je dois partir | I have to leave |
| je devais partir | I had to leave |
| j'ai du partir | I must have left |
| tu dois étudier | you have to study |
| tu devais étudier | you were supposed to study |
| tu as du étudier | you must have studied |
| il doit partir | he has to leave |
| il devait partir | he had to leave |
| il a du partir | he must have left |
| nous devons répondre | we must answer |
| nous devions répondre | we were supposed to answer |
| nous avons du répondre | we must have answered |
| vous devez etre à l'heure | you have to be on time |
| vous deviez etre à l'heure | you had to be on time |
| vous avez du etre à l'heure | you must have been on time |
| ils doivent etre calés | they must be smart |
| ils ont du etre calés | they must have been smart |
