English verb conjugation
COULD HELIOGRAPH

Regular verb: heliograph - heliographed - heliographed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I could not heliograph you could not heliograph he could not heliograph we could not heliograph you could not heliograph they could not heliograph	I could not be heliographing you could not be heliographing he could not be heliographing we could not be heliographing you could not be heliographing they could not be heliographing
Perfect	V-ing perfect
I could not have heliographed you could not have heliographed he could not have heliographed we could not have heliographed you could not have heliographed they could not have heliographed	I could not have been heliographing you could not have been heliographing he could not have been heliographing we could not have been heliographing you could not have been heliographing they could not have been heliographing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
could I not heliograph? could you not heliograph? could he not heliograph? could we not heliograph? could you not heliograph? could they not heliograph?	could I not be heliographing? could you not be heliographing? could he not be heliographing? could we not be heliographing? could you not be heliographing? could they not be heliographing?
Perfect	V-ing perfect
could I not have heliographed? could you not have heliographed? could he not have heliographed? could we not have heliographed? could you not have heliographed? could they not have heliographed?	could I not have been heliographing? could you not have been heliographing? could he not have been heliographing? could we not have been heliographing? could you not have been heliographing? could they not have been heliographing?