must lave
Regular verb: lave - laved- laved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must lave
you must lave
he must lave
we must lave
you must lave
they must lave 	I must be laving
you must be laving
he must be laving
we must be laving
you must be laving
they must be laving	I must have laved
you must have laved
he must have laved
we must have laved
you must have laved
they must have laved	I must have been laving
you must have been laving
he must have been laving
we must have been laving
you must have been laving
they must have been laving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't lave
you mustn't lave
he mustn't lave
we mustn't lave
you mustn't lave
they mustn't lave 	I mustn't be laving
you mustn't be laving
he mustn't be laving
we mustn't be laving
you mustn't be laving
they mustn't be laving	I mustn't have laved
you mustn't have laved
he mustn't have laved
we mustn't have laved
you mustn't have laved
they mustn't have laved	I mustn't have been laving
you mustn't have been laving
he mustn't have been laving
we mustn't have been laving
you mustn't have been laving
they mustn't have been laving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I lave?
must you lave?
must he lave?
must we lave?
must you lave?
must they lave? 	must I be laving?
must you be laving?
must he be laving?
must we be laving?
must you be laving?
must they be laving? 	must I have laved?
must you have laved?
must he have laved?
must we have laved?
must you have laved?
must they have laved? 	must I have been laving?
must you have been laving?
must he have been laving?
must we have been laving?
must you have been laving?
must they have been laving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I lave?
mustn't you lave?
mustn't he lave?
mustn't we lave?
mustn't you lave?
mustn't they lave? 	mustn't I be laving?
mustn't you be laving?
mustn't he be laving?
mustn't we be laving?
mustn't you be laving?
mustn't they be laving? 	mustn't I have laved?
mustn't you have laved?
mustn't he have laved?
mustn't we have laved?
mustn't you have laved?
mustn't they have laved? 	mustn't I have been laving?
mustn't you have been laving?
mustn't he have been laving?
mustn't we have been laving?
mustn't you have been laving?
mustn't they have been laving?