must ache
Regular verb: ache - ached- ached

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