must lyse
Regular verb: lyse - lysed- lysed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must lyse
you must lyse
she must lyse
we must lyse
you must lyse
they must lyse 	I must be lysing
you must be lysing
she must be lysing
we must be lysing
you must be lysing
they must be lysing	I must have lysed
you must have lysed
she must have lysed
we must have lysed
you must have lysed
they must have lysed	I must have been lysing
you must have been lysing
she must have been lysing
we must have been lysing
you must have been lysing
they must have been lysing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't lyse
you mustn't lyse
she mustn't lyse
we mustn't lyse
you mustn't lyse
they mustn't lyse 	I mustn't be lysing
you mustn't be lysing
she mustn't be lysing
we mustn't be lysing
you mustn't be lysing
they mustn't be lysing	I mustn't have lysed
you mustn't have lysed
she mustn't have lysed
we mustn't have lysed
you mustn't have lysed
they mustn't have lysed	I mustn't have been lysing
you mustn't have been lysing
she mustn't have been lysing
we mustn't have been lysing
you mustn't have been lysing
they mustn't have been lysing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I lyse?
must you lyse?
must she lyse?
must we lyse?
must you lyse?
must they lyse? 	must I be lysing?
must you be lysing?
must she be lysing?
must we be lysing?
must you be lysing?
must they be lysing? 	must I have lysed?
must you have lysed?
must she have lysed?
must we have lysed?
must you have lysed?
must they have lysed? 	must I have been lysing?
must you have been lysing?
must she have been lysing?
must we have been lysing?
must you have been lysing?
must they have been lysing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I lyse?
mustn't you lyse?
mustn't she lyse?
mustn't we lyse?
mustn't you lyse?
mustn't they lyse? 	mustn't I be lysing?
mustn't you be lysing?
mustn't she be lysing?
mustn't we be lysing?
mustn't you be lysing?
mustn't they be lysing? 	mustn't I have lysed?
mustn't you have lysed?
mustn't she have lysed?
mustn't we have lysed?
mustn't you have lysed?
mustn't they have lysed? 	mustn't I have been lysing?
mustn't you have been lysing?
mustn't she have been lysing?
mustn't we have been lysing?
mustn't you have been lysing?
mustn't they have been lysing?