must grey
Verbo regular: grey - greyed- greyed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not grey
you must not grey
he must not grey
we must not grey
you must not grey
they must not grey 	I must not be greying
you must not be greying
he must not be greying
we must not be greying
you must not be greying
they must not be greying	I must not have greyed
you must not have greyed
he must not have greyed
we must not have greyed
you must not have greyed
they must not have greyed	I must not have been greying
you must not have been greying
he must not have been greying
we must not have been greying
you must not have been greying
they must not have been greying	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not grey?
must you not grey?
must he not grey?
must we not grey?
must you not grey?
must they not grey? 	must I not be greying?
must you not be greying?
must he not be greying?
must we not be greying?
must you not be greying?
must they not be greying? 	must I not have greyed?
must you not have greyed?
must he not have greyed?
must we not have greyed?
must you not have greyed?
must they not have greyed? 	must I not have been greying?
must you not have been greying?
must he not have been greying?
must we not have been greying?
must you not have been greying?
must they not have been greying?