must lay
Verbe irrégulier : lay - laid- laid
Traduction française : poser à plat 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must lay
you must lay
she must lay
we must lay
you must lay
they must lay 	I must be laying
you must be laying
she must be laying
we must be laying
you must be laying
they must be laying	I must have laid
you must have laid
she 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
she must have been laying
we must have been laying
you must have been laying
they must have been laying	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not lay
you must not lay
she must not lay
we must not lay
you must not lay
they must not lay 	I must not be laying
you must not be laying
she must not be laying
we must not be laying
you must not be laying
they must not be laying	I must not have laid
you must not have laid
she must not have laid
we must not have laid
you must not have laid
they must not have laid	I must not have been laying
you must not have been laying
she must not have been laying
we must not have been laying
you must not have been laying
they must not have been laying	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I lay?
must you lay?
must she lay?
must we lay?
must you lay?
must they lay? 	must I be laying?
must you be laying?
must she be laying?
must we be laying?
must you be laying?
must they be laying? 	must I have laid?
must you have laid?
must she 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 she have been laying?
must we have been laying?
must you have been laying?
must they have been laying? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not lay?
must you not lay?
must she not lay?
must we not lay?
must you not lay?
must they not lay? 	must I not be laying?
must you not be laying?
must she not be laying?
must we not be laying?
must you not be laying?
must they not be laying? 	must I not have laid?
must you not have laid?
must she not have laid?
must we not have laid?
must you not have laid?
must they not have laid? 	must I not have been laying?
must you not have been laying?
must she not have been laying?
must we not have been laying?
must you not have been laying?
must they not have been laying?