I could undertain you could undertain he could undertain we could undertain you could undertain they could undertain
Forme en V-ing
I could be undertaining you could be undertaining he could be undertaining we could be undertaining you could be undertaining they could be undertaining
Perfect
I could have undertained you could have undertained he could have undertained we could have undertained you could have undertained they could have undertained
Perfect en V-ing
I could have been undertaining you could have been undertaining he could have been undertaining we could have been undertaining you could have been undertaining they could have been undertaining
Négation
Forme simple
I couldn't undertain you couldn't undertain he couldn't undertain we couldn't undertain you couldn't undertain they couldn't undertain
Forme en V-ing
I couldn't be undertaining you couldn't be undertaining he couldn't be undertaining we couldn't be undertaining you couldn't be undertaining they couldn't be undertaining
Perfect
I couldn't have undertained you couldn't have undertained he couldn't have undertained we couldn't have undertained you couldn't have undertained they couldn't have undertained
Perfect en V-ing
I couldn't have been undertaining you couldn't have been undertaining he couldn't have been undertaining we couldn't have been undertaining you couldn't have been undertaining they couldn't have been undertaining
Forme interrogative
Forme simple
could I undertain? could you undertain? could he undertain? could we undertain? could you undertain? could they undertain?
Forme en V-ing
could I be undertaining? could you be undertaining? could he be undertaining? could we be undertaining? could you be undertaining? could they be undertaining?
Perfect
could I have undertained? could you have undertained? could he have undertained? could we have undertained? could you have undertained? could they have undertained?
Perfect en V-ing
could I have been undertaining? could you have been undertaining? could he have been undertaining? could we have been undertaining? could you have been undertaining? could they have been undertaining?
Forme interro-négative
Forme simple
couldn't I undertain? couldn't you undertain? couldn't he undertain? couldn't we undertain? couldn't you undertain? couldn't they undertain?
Forme en V-ing
couldn't I be undertaining? couldn't you be undertaining? couldn't he be undertaining? couldn't we be undertaining? couldn't you be undertaining? couldn't they be undertaining?
Perfect
couldn't I have undertained? couldn't you have undertained? couldn't he have undertained? couldn't we have undertained? couldn't you have undertained? couldn't they have undertained?
Perfect en V-ing
couldn't I have been undertaining? couldn't you have been undertaining? couldn't he have been undertaining? couldn't we have been undertaining? couldn't you have been undertaining? couldn't they have been undertaining?