
Verbe régulier : undertain - undertained - undertained
| Présent | Présent continu | Prétérit | Prétérit continu | 
| I undertain you undertain he undertains we undertain you undertain they undertain | I am undertaining you are undertaining he is undertaining we are undertaining you are undertaining they are undertaining | I undertained you undertained he undertained we undertained you undertained they undertained | I was undertaining you were undertaining he was undertaining we were undertaining you were undertaining they were undertaining | 
| Present perfect | Present perfect continu | Pluperfect | Pluperfect continu | 
| I have undertained you have undertained he has undertained we have undertained you have undertained they have undertained | I have been undertaining you have been undertaining he has been undertaining we have been undertaining you have been undertaining they have been undertaining | I had undertained you had undertained he had undertained we had undertained you had undertained they had undertained | I had been undertaining you had been undertaining he had been undertaining we had been undertaining you had been undertaining they had been undertaining | 
| Futur | Futur continu | Futur antérieur | Futur antérieur continu | 
| I will undertain you will undertain he will undertain we will undertain you will undertain they will undertain | I will be undertaining you will be undertaining he will be undertaining we will be undertaining you will be undertaining they will be undertaining | I will have undertained you will have undertained he will have undertained we will have undertained you will have undertained they will have undertained | I will have been undertaining you will have been undertaining he will have been undertaining we will have been undertaining you will have been undertaining they will have been undertaining | 
| Présent | Présent continu | Passé | Passé continu | 
| I would undertain you would undertain he would undertain we would undertain you would undertain they would undertain | I would be undertaining you would be undertaining he would be undertaining we would be undertaining you would be undertaining they would be undertaining | I would have undertained you would have undertained he would have undertained we would have undertained you would have undertained they would have undertained | I would have been undertaining you would have been undertaining he would have been undertaining we would have been undertaining you would have been undertaining they would have been undertaining | 
| Infinitif | Impératif | 
| Infinitif | Impératif | ||
| to undertain | undertain Let's undertain undertain | 
| Présent | Passé | ||
| undertaining | undertained |