must linger
Regular verb: linger - lingered- lingered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must linger
you must linger
she must linger
we must linger
you must linger
they must linger 	I must be lingering
you must be lingering
she must be lingering
we must be lingering
you must be lingering
they must be lingering	I must have lingered
you must have lingered
she must have lingered
we must have lingered
you must have lingered
they must have lingered	I must have been lingering
you must have been lingering
she must have been lingering
we must have been lingering
you must have been lingering
they must have been lingering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't linger
you mustn't linger
she mustn't linger
we mustn't linger
you mustn't linger
they mustn't linger 	I mustn't be lingering
you mustn't be lingering
she mustn't be lingering
we mustn't be lingering
you mustn't be lingering
they mustn't be lingering	I mustn't have lingered
you mustn't have lingered
she mustn't have lingered
we mustn't have lingered
you mustn't have lingered
they mustn't have lingered	I mustn't have been lingering
you mustn't have been lingering
she mustn't have been lingering
we mustn't have been lingering
you mustn't have been lingering
they mustn't have been lingering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I linger?
must you linger?
must she linger?
must we linger?
must you linger?
must they linger? 	must I be lingering?
must you be lingering?
must she be lingering?
must we be lingering?
must you be lingering?
must they be lingering? 	must I have lingered?
must you have lingered?
must she have lingered?
must we have lingered?
must you have lingered?
must they have lingered? 	must I have been lingering?
must you have been lingering?
must she have been lingering?
must we have been lingering?
must you have been lingering?
must they have been lingering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I linger?
mustn't you linger?
mustn't she linger?
mustn't we linger?
mustn't you linger?
mustn't they linger? 	mustn't I be lingering?
mustn't you be lingering?
mustn't she be lingering?
mustn't we be lingering?
mustn't you be lingering?
mustn't they be lingering? 	mustn't I have lingered?
mustn't you have lingered?
mustn't she have lingered?
mustn't we have lingered?
mustn't you have lingered?
mustn't they have lingered? 	mustn't I have been lingering?
mustn't you have been lingering?
mustn't she have been lingering?
mustn't we have been lingering?
mustn't you have been lingering?
mustn't they have been lingering?