must grey
Verbo regular: grey - greyed- greyed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must grey
you must grey
he must grey
we must grey
you must grey
they must grey 	I must be greying
you must be greying
he must be greying
we must be greying
you must be greying
they must be greying	I must have greyed
you must have greyed
he must have greyed
we must have greyed
you must have greyed
they must have greyed	I must have been greying
you must have been greying
he must have been greying
we must have been greying
you must have been greying
they must have been greying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't grey
you mustn't grey
he mustn't grey
we mustn't grey
you mustn't grey
they mustn't grey 	I mustn't be greying
you mustn't be greying
he mustn't be greying
we mustn't be greying
you mustn't be greying
they mustn't be greying	I mustn't have greyed
you mustn't have greyed
he mustn't have greyed
we mustn't have greyed
you mustn't have greyed
they mustn't have greyed	I mustn't have been greying
you mustn't have been greying
he mustn't have been greying
we mustn't have been greying
you mustn't have been greying
they mustn't have been greying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I grey?
must you grey?
must he grey?
must we grey?
must you grey?
must they grey? 	must I be greying?
must you be greying?
must he be greying?
must we be greying?
must you be greying?
must they be greying? 	must I have greyed?
must you have greyed?
must he have greyed?
must we have greyed?
must you have greyed?
must they have greyed? 	must I have been greying?
must you have been greying?
must he have been greying?
must we have been greying?
must you have been greying?
must they have been greying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I grey?
mustn't you grey?
mustn't he grey?
mustn't we grey?
mustn't you grey?
mustn't they grey? 	mustn't I be greying?
mustn't you be greying?
mustn't he be greying?
mustn't we be greying?
mustn't you be greying?
mustn't they be greying? 	mustn't I have greyed?
mustn't you have greyed?
mustn't he have greyed?
mustn't we have greyed?
mustn't you have greyed?
mustn't they have greyed? 	mustn't I have been greying?
mustn't you have been greying?
mustn't he have been greying?
mustn't we have been greying?
mustn't you have been greying?
mustn't they have been greying?