I could heliograph you could heliograph she could heliograph we could heliograph you could heliograph they could heliograph
Forme en V-ing
I could be heliographing you could be heliographing she could be heliographing we could be heliographing you could be heliographing they could be heliographing
Perfect
I could have heliographed you could have heliographed she could have heliographed we could have heliographed you could have heliographed they could have heliographed
Perfect en V-ing
I could have been heliographing you could have been heliographing she could have been heliographing we could have been heliographing you could have been heliographing they could have been heliographing
Négation
Forme simple
I could not heliograph you could not heliograph she could not heliograph we could not heliograph you could not heliograph they could not heliograph
Forme en V-ing
I could not be heliographing you could not be heliographing she could not be heliographing we could not be heliographing you could not be heliographing they could not be heliographing
Perfect
I could not have heliographed you could not have heliographed she could not have heliographed we could not have heliographed you could not have heliographed they could not have heliographed
Perfect en V-ing
I could not have been heliographing you could not have been heliographing she could not have been heliographing we could not have been heliographing you could not have been heliographing they could not have been heliographing
Forme interrogative
Forme simple
could I heliograph? could you heliograph? could she heliograph? could we heliograph? could you heliograph? could they heliograph?
Forme en V-ing
could I be heliographing? could you be heliographing? could she be heliographing? could we be heliographing? could you be heliographing? could they be heliographing?
Perfect
could I have heliographed? could you have heliographed? could she have heliographed? could we have heliographed? could you have heliographed? could they have heliographed?
Perfect en V-ing
could I have been heliographing? could you have been heliographing? could she have been heliographing? could we have been heliographing? could you have been heliographing? could they have been heliographing?
Forme interro-négative
Forme simple
could I not heliograph? could you not heliograph? could she not heliograph? could we not heliograph? could you not heliograph? could they not heliograph?
Forme en V-ing
could I not be heliographing? could you not be heliographing? could she not be heliographing? could we not be heliographing? could you not be heliographing? could they not be heliographing?
Perfect
could I not have heliographed? could you not have heliographed? could she not have heliographed? could we not have heliographed? could you not have heliographed? could they not have heliographed?
Perfect en V-ing
could I not have been heliographing? could you not have been heliographing? could she not have been heliographing? could we not have been heliographing? could you not have been heliographing? could they not have been heliographing?