I can ache you can ache he can ache we can ache you can ache they can ache
V-ing form
I can be aching you can be aching he can be aching we can be aching you can be aching they can be aching
Perfect
I can have ached you can have ached he can have ached we can have ached you can have ached they can have ached
V-ing perfect
I can have been aching you can have been aching he can have been aching we can have been aching you can have been aching they can have been aching
Negation
Simple form
I can't ache you can't ache he can't ache we can't ache you can't ache they can't ache
V-ing form
I can't be aching you can't be aching he can't be aching we can't be aching you can't be aching they can't be aching
Perfect
I can't have ached you can't have ached he can't have ached we can't have ached you can't have ached they can't have ached
V-ing perfect
I can't have been aching you can't have been aching he can't have been aching we can't have been aching you can't have been aching they can't have been aching
Interrogative form
Simple form
can I ache? can you ache? can he ache? can we ache? can you ache? can they ache?
V-ing form
can I be aching? can you be aching? can he be aching? can we be aching? can you be aching? can they be aching?
Perfect
can I have ached? can you have ached? can he have ached? can we have ached? can you have ached? can they have ached?
V-ing perfect
can I have been aching? can you have been aching? can he have been aching? can we have been aching? can you have been aching? can they have been aching?
Interro-negative form
Simple form
can't I ache? can't you ache? can't he ache? can't we ache? can't you ache? can't they ache?
V-ing form
can't I be aching? can't you be aching? can't he be aching? can't we be aching? can't you be aching? can't they be aching?
Perfect
can't I have ached? can't you have ached? can't he have ached? can't we have ached? can't you have ached? can't they have ached?
V-ing perfect
can't I have been aching? can't you have been aching? can't he have been aching? can't we have been aching? can't you have been aching? can't they have been aching?