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
she could heliograph
we could heliograph
you could heliograph
they could heliograph 	I could be heliographing
you could be heliographing
she could be heliographing
we could be heliographing
you could be heliographing
they could be heliographing	I could have heliographed
you could have heliographed
she 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
she 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
she 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
she 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
she 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
she 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 she heliograph?
could we heliograph?
could you heliograph?
could they heliograph? 	could I be heliographing?
could you be heliographing?
could she be heliographing?
could we be heliographing?
could you be heliographing?
could they be heliographing? 	could I have heliographed?
could you have heliographed?
could she 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 she 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 she 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 she 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 she 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 she have been heliographing?
couldn't we have been heliographing?
couldn't you have been heliographing?
couldn't they have been heliographing?