could heliograph
Verbe régulier : heliograph - heliographed- heliographed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could heliograph
you could heliograph
he could heliograph
we could heliograph
you could heliograph
they could heliograph 	I could be heliographing
you could be heliographing
he could be heliographing
we could be heliographing
you could be heliographing
they could be heliographing	I could have heliographed
you could have heliographed
he could have heliographed
we could have heliographed
you could have heliographed
they could have heliographed	I could have been heliographing
you could have been heliographing
he could have been heliographing
we could have been heliographing
you could have been heliographing
they could have been heliographing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't heliograph
you couldn't heliograph
he couldn't heliograph
we couldn't heliograph
you couldn't heliograph
they couldn't heliograph 	I couldn't be heliographing
you couldn't be heliographing
he couldn't be heliographing
we couldn't be heliographing
you couldn't be heliographing
they couldn't be heliographing	I couldn't have heliographed
you couldn't have heliographed
he couldn't have heliographed
we couldn't have heliographed
you couldn't have heliographed
they couldn't have heliographed	I couldn't have been heliographing
you couldn't have been heliographing
he couldn't have been heliographing
we couldn't have been heliographing
you couldn't have been heliographing
they couldn't have been heliographing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I heliograph?
could you heliograph?
could he heliograph?
could we heliograph?
could you heliograph?
could they heliograph? 	could I be heliographing?
could you be heliographing?
could he be heliographing?
could we be heliographing?
could you be heliographing?
could they be heliographing? 	could I have heliographed?
could you have heliographed?
could he have heliographed?
could we have heliographed?
could you have heliographed?
could they have heliographed? 	could I have been heliographing?
could you have been heliographing?
could he have been heliographing?
could we have been heliographing?
could you have been heliographing?
could they have been heliographing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I heliograph?
couldn't you heliograph?
couldn't he heliograph?
couldn't we heliograph?
couldn't you heliograph?
couldn't they heliograph? 	couldn't I be heliographing?
couldn't you be heliographing?
couldn't he be heliographing?
couldn't we be heliographing?
couldn't you be heliographing?
couldn't they be heliographing? 	couldn't I have heliographed?
couldn't you have heliographed?
couldn't he have heliographed?
couldn't we have heliographed?
couldn't you have heliographed?
couldn't they have heliographed? 	couldn't I have been heliographing?
couldn't you have been heliographing?
couldn't he have been heliographing?
couldn't we have been heliographing?
couldn't you have been heliographing?
couldn't they have been heliographing?