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