English verb conjugation
MUST ACHE

Regular verb: ache - ached - ached

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?