I can heliograph you can heliograph he can heliograph we can heliograph you can heliograph they can heliograph
V-ing form
I can be heliographing you can be heliographing he can be heliographing we can be heliographing you can be heliographing they can be heliographing
Perfect
I can have heliographed you can have heliographed he 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 he can have been heliographing we can have been heliographing you can have been heliographing they can have been heliographing
Negation
Simple form
I can't heliograph you can't heliograph he can't heliograph we can't heliograph you can't heliograph they can't heliograph
V-ing form
I can't be heliographing you can't be heliographing he can't be heliographing we can't be heliographing you can't be heliographing they can't be heliographing
Perfect
I can't have heliographed you can't have heliographed he can't have heliographed we can't have heliographed you can't have heliographed they can't have heliographed
V-ing perfect
I can't have been heliographing you can't have been heliographing he can't have been heliographing we can't have been heliographing you can't have been heliographing they can't have been heliographing
Interrogative form
Simple form
can I heliograph? can you heliograph? can he heliograph? can we heliograph? can you heliograph? can they heliograph?
V-ing form
can I be heliographing? can you be heliographing? can he be heliographing? can we be heliographing? can you be heliographing? can they be heliographing?
Perfect
can I have heliographed? can you have heliographed? can he 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 he have been heliographing? can we have been heliographing? can you have been heliographing? can they have been heliographing?
Interro-negative form
Simple form
can't I heliograph? can't you heliograph? can't he heliograph? can't we heliograph? can't you heliograph? can't they heliograph?
V-ing form
can't I be heliographing? can't you be heliographing? can't he be heliographing? can't we be heliographing? can't you be heliographing? can't they be heliographing?
Perfect
can't I have heliographed? can't you have heliographed? can't he have heliographed? can't we have heliographed? can't you have heliographed? can't they have heliographed?
V-ing perfect
can't I have been heliographing? can't you have been heliographing? can't he have been heliographing? can't we have been heliographing? can't you have been heliographing? can't they have been heliographing?