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 must not lave
you must not lave
he must not lave
we must not lave
you must not lave
they must not lave 	I must not be laving
you must not be laving
he must not be laving
we must not be laving
you must not be laving
they must not be laving	I must not have laved
you must not have laved
he must not have laved
we must not have laved
you must not have laved
they must not have laved	I must not have been laving
you must not have been laving
he must not have been laving
we must not have been laving
you must not have been laving
they must not 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 	
must I not lave?
must you not lave?
must he not lave?
must we not lave?
must you not lave?
must they not lave? 	must I not be laving?
must you not be laving?
must he not be laving?
must we not be laving?
must you not be laving?
must they not be laving? 	must I not have laved?
must you not have laved?
must he not have laved?
must we not have laved?
must you not have laved?
must they not have laved? 	must I not have been laving?
must you not have been laving?
must he not have been laving?
must we not have been laving?
must you not have been laving?
must they not have been laving?