could ache
Regular verb: ache - ached- ached

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could ache
you could ache
she could ache
we could ache
you could ache
they could ache 	I could be aching
you could be aching
she could be aching
we could be aching
you could be aching
they could be aching	I could have ached
you could have ached
she 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
she 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
she 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
she 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
she 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
she 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 she ache?
could we ache?
could you ache?
could they ache? 	could I be aching?
could you be aching?
could she be aching?
could we be aching?
could you be aching?
could they be aching? 	could I have ached?
could you have ached?
could she 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 she 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 she 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 she 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 she 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 she have been aching?
couldn't we have been aching?
couldn't you have been aching?
couldn't they have been aching?