I can ache you can ache she can ache we can ache you can ache they can ache
V-ing form
I can be aching you can be aching she can be aching we can be aching you can be aching they can be aching
Perfect
I can have ached you can have ached she 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 she can have been aching we can have been aching you can have been aching they can have been aching
Negation
Simple form
I cannot ache you cannot ache she cannot ache we cannot ache you cannot ache they cannot ache
V-ing form
I cannot be aching you cannot be aching she cannot be aching we cannot be aching you cannot be aching they cannot be aching
Perfect
I cannot have ached you cannot have ached she cannot have ached we cannot have ached you cannot have ached they cannot have ached
V-ing perfect
I cannot have been aching you cannot have been aching she cannot have been aching we cannot have been aching you cannot have been aching they cannot have been aching
Interrogative form
Simple form
can I ache? can you ache? can she ache? can we ache? can you ache? can they ache?
V-ing form
can I be aching? can you be aching? can she be aching? can we be aching? can you be aching? can they be aching?
Perfect
can I have ached? can you have ached? can she 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 she have been aching? can we have been aching? can you have been aching? can they have been aching?
Interro-negative form
Simple form
can I not ache? can you not ache? can she not ache? can we not ache? can you not ache? can they not ache?
V-ing form
can I not be aching? can you not be aching? can she not be aching? can we not be aching? can you not be aching? can they not be aching?
Perfect
can I not have ached? can you not have ached? can she not have ached? can we not have ached? can you not have ached? can they not have ached?
V-ing perfect
can I not have been aching? can you not have been aching? can she not have been aching? can we not have been aching? can you not have been aching? can they not have been aching?