English verb conjugation
MUST RETIRE

Regular verb: retire - retired - retired

Affirmation

Simple form	V-ing form
I must retire you must retire she must retire we must retire you must retire they must retire	I must be retiring you must be retiring she must be retiring we must be retiring you must be retiring they must be retiring
Perfect	V-ing perfect
I must have retired you must have retired she must have retired we must have retired you must have retired they must have retired	I must have been retiring you must have been retiring she must have been retiring we must have been retiring you must have been retiring they must have been retiring

Negation

Simple form	V-ing form
I mustn't retire you mustn't retire she mustn't retire we mustn't retire you mustn't retire they mustn't retire	I mustn't be retiring you mustn't be retiring she mustn't be retiring we mustn't be retiring you mustn't be retiring they mustn't be retiring
Perfect	V-ing perfect
I mustn't have retired you mustn't have retired she mustn't have retired we mustn't have retired you mustn't have retired they mustn't have retired	I mustn't have been retiring you mustn't have been retiring she mustn't have been retiring we mustn't have been retiring you mustn't have been retiring they mustn't have been retiring

Interrogative form

Simple form	V-ing form
must I retire? must you retire? must she retire? must we retire? must you retire? must they retire?	must I be retiring? must you be retiring? must she be retiring? must we be retiring? must you be retiring? must they be retiring?
Perfect	V-ing perfect
must I have retired? must you have retired? must she have retired? must we have retired? must you have retired? must they have retired?	must I have been retiring? must you have been retiring? must she have been retiring? must we have been retiring? must you have been retiring? must they have been retiring?

Interro-negative form

Simple form	V-ing form
mustn't I retire? mustn't you retire? mustn't she retire? mustn't we retire? mustn't you retire? mustn't they retire?	mustn't I be retiring? mustn't you be retiring? mustn't she be retiring? mustn't we be retiring? mustn't you be retiring? mustn't they be retiring?
Perfect	V-ing perfect
mustn't I have retired? mustn't you have retired? mustn't she have retired? mustn't we have retired? mustn't you have retired? mustn't they have retired?	mustn't I have been retiring? mustn't you have been retiring? mustn't she have been retiring? mustn't we have been retiring? mustn't you have been retiring? mustn't they have been retiring?