I can heliograph you can heliograph she can heliograph we can heliograph you can heliograph they can heliograph
V-ing form
I can be heliographing you can be heliographing she can be heliographing we can be heliographing you can be heliographing they can be heliographing
Perfect
I can have heliographed you can have heliographed she can have heliographed we can have heliographed you can have heliographed they can have heliographed
V-ing perfect
I can have been heliographing you can have been heliographing she can have been heliographing we can have been heliographing you can have been heliographing they can have been heliographing
Negation
Simple form
I cannot heliograph you cannot heliograph she cannot heliograph we cannot heliograph you cannot heliograph they cannot heliograph
V-ing form
I cannot be heliographing you cannot be heliographing she cannot be heliographing we cannot be heliographing you cannot be heliographing they cannot be heliographing
Perfect
I cannot have heliographed you cannot have heliographed she cannot have heliographed we cannot have heliographed you cannot have heliographed they cannot have heliographed
V-ing perfect
I cannot have been heliographing you cannot have been heliographing she cannot have been heliographing we cannot have been heliographing you cannot have been heliographing they cannot have been heliographing
Interrogative form
Simple form
can I heliograph? can you heliograph? can she heliograph? can we heliograph? can you heliograph? can they heliograph?
V-ing form
can I be heliographing? can you be heliographing? can she be heliographing? can we be heliographing? can you be heliographing? can they be heliographing?
Perfect
can I have heliographed? can you have heliographed? can she have heliographed? can we have heliographed? can you have heliographed? can they have heliographed?
V-ing perfect
can I have been heliographing? can you have been heliographing? can she have been heliographing? can we have been heliographing? can you have been heliographing? can they have been heliographing?
Interro-negative form
Simple form
can I not heliograph? can you not heliograph? can she not heliograph? can we not heliograph? can you not heliograph? can they not heliograph?
V-ing form
can I not be heliographing? can you not be heliographing? can she not be heliographing? can we not be heliographing? can you not be heliographing? can they not be heliographing?
Perfect
can I not have heliographed? can you not have heliographed? can she not have heliographed? can we not have heliographed? can you not have heliographed? can they not have heliographed?
V-ing perfect
can I not have been heliographing? can you not have been heliographing? can she not have been heliographing? can we not have been heliographing? can you not have been heliographing? can they not have been heliographing?