must lay
Irregular verb: lay - laid- laid

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must lay
you must lay
he must lay
we must lay
you must lay
they must lay 	I must be laying
you must be laying
he must be laying
we must be laying
you must be laying
they must be laying	I must have laid
you must have laid
he must have laid
we must have laid
you must have laid
they must have laid	I must have been laying
you must have been laying
he must have been laying
we must have been laying
you must have been laying
they must have been laying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't lay
you mustn't lay
he mustn't lay
we mustn't lay
you mustn't lay
they mustn't lay 	I mustn't be laying
you mustn't be laying
he mustn't be laying
we mustn't be laying
you mustn't be laying
they mustn't be laying	I mustn't have laid
you mustn't have laid
he mustn't have laid
we mustn't have laid
you mustn't have laid
they mustn't have laid	I mustn't have been laying
you mustn't have been laying
he mustn't have been laying
we mustn't have been laying
you mustn't have been laying
they mustn't have been laying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I lay?
must you lay?
must he lay?
must we lay?
must you lay?
must they lay? 	must I be laying?
must you be laying?
must he be laying?
must we be laying?
must you be laying?
must they be laying? 	must I have laid?
must you have laid?
must he have laid?
must we have laid?
must you have laid?
must they have laid? 	must I have been laying?
must you have been laying?
must he have been laying?
must we have been laying?
must you have been laying?
must they have been laying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I lay?
mustn't you lay?
mustn't he lay?
mustn't we lay?
mustn't you lay?
mustn't they lay? 	mustn't I be laying?
mustn't you be laying?
mustn't he be laying?
mustn't we be laying?
mustn't you be laying?
mustn't they be laying? 	mustn't I have laid?
mustn't you have laid?
mustn't he have laid?
mustn't we have laid?
mustn't you have laid?
mustn't they have laid? 	mustn't I have been laying?
mustn't you have been laying?
mustn't he have been laying?
mustn't we have been laying?
mustn't you have been laying?
mustn't they have been laying?