could ache
Regular verb: ache - ached- ached

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could ache
you could ache
he could ache
we could ache
you could ache
they could ache 	I could be aching
you could be aching
he could be aching
we could be aching
you could be aching
they could be aching	I could have ached
you could have ached
he could have ached
we could have ached
you could have ached
they could have ached	I could have been aching
you could have been aching
he could have been aching
we could have been aching
you could have been aching
they could have been aching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't ache
you couldn't ache
he couldn't ache
we couldn't ache
you couldn't ache
they couldn't ache 	I couldn't be aching
you couldn't be aching
he couldn't be aching
we couldn't be aching
you couldn't be aching
they couldn't be aching	I couldn't have ached
you couldn't have ached
he couldn't have ached
we couldn't have ached
you couldn't have ached
they couldn't have ached	I couldn't have been aching
you couldn't have been aching
he couldn't have been aching
we couldn't have been aching
you couldn't have been aching
they couldn't have been aching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I ache?
could you ache?
could he ache?
could we ache?
could you ache?
could they ache? 	could I be aching?
could you be aching?
could he be aching?
could we be aching?
could you be aching?
could they be aching? 	could I have ached?
could you have ached?
could he have ached?
could we have ached?
could you have ached?
could they have ached? 	could I have been aching?
could you have been aching?
could he have been aching?
could we have been aching?
could you have been aching?
could they have been aching? 	

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