must lament
Regular verb: lament - lamented- lamented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must lament
you must lament
she must lament
we must lament
you must lament
they must lament 	I must be lamenting
you must be lamenting
she must be lamenting
we must be lamenting
you must be lamenting
they must be lamenting	I must have lamented
you must have lamented
she must have lamented
we must have lamented
you must have lamented
they must have lamented	I must have been lamenting
you must have been lamenting
she must have been lamenting
we must have been lamenting
you must have been lamenting
they must have been lamenting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't lament
you mustn't lament
she mustn't lament
we mustn't lament
you mustn't lament
they mustn't lament 	I mustn't be lamenting
you mustn't be lamenting
she mustn't be lamenting
we mustn't be lamenting
you mustn't be lamenting
they mustn't be lamenting	I mustn't have lamented
you mustn't have lamented
she mustn't have lamented
we mustn't have lamented
you mustn't have lamented
they mustn't have lamented	I mustn't have been lamenting
you mustn't have been lamenting
she mustn't have been lamenting
we mustn't have been lamenting
you mustn't have been lamenting
they mustn't have been lamenting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I lament?
must you lament?
must she lament?
must we lament?
must you lament?
must they lament? 	must I be lamenting?
must you be lamenting?
must she be lamenting?
must we be lamenting?
must you be lamenting?
must they be lamenting? 	must I have lamented?
must you have lamented?
must she have lamented?
must we have lamented?
must you have lamented?
must they have lamented? 	must I have been lamenting?
must you have been lamenting?
must she have been lamenting?
must we have been lamenting?
must you have been lamenting?
must they have been lamenting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I lament?
mustn't you lament?
mustn't she lament?
mustn't we lament?
mustn't you lament?
mustn't they lament? 	mustn't I be lamenting?
mustn't you be lamenting?
mustn't she be lamenting?
mustn't we be lamenting?
mustn't you be lamenting?
mustn't they be lamenting? 	mustn't I have lamented?
mustn't you have lamented?
mustn't she have lamented?
mustn't we have lamented?
mustn't you have lamented?
mustn't they have lamented? 	mustn't I have been lamenting?
mustn't you have been lamenting?
mustn't she have been lamenting?
mustn't we have been lamenting?
mustn't you have been lamenting?
mustn't they have been lamenting?