must ache
Regular verb: ache - ached- ached

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

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

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

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