must gray
Verbo regular: gray - grayed- grayed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must gray
you must gray
he must gray
we must gray
you must gray
they must gray 	I must be graying
you must be graying
he must be graying
we must be graying
you must be graying
they must be graying	I must have grayed
you must have grayed
he must have grayed
we must have grayed
you must have grayed
they must have grayed	I must have been graying
you must have been graying
he must have been graying
we must have been graying
you must have been graying
they must have been graying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not gray
you must not gray
he must not gray
we must not gray
you must not gray
they must not gray 	I must not be graying
you must not be graying
he must not be graying
we must not be graying
you must not be graying
they must not be graying	I must not have grayed
you must not have grayed
he must not have grayed
we must not have grayed
you must not have grayed
they must not have grayed	I must not have been graying
you must not have been graying
he must not have been graying
we must not have been graying
you must not have been graying
they must not have been graying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I gray?
must you gray?
must he gray?
must we gray?
must you gray?
must they gray? 	must I be graying?
must you be graying?
must he be graying?
must we be graying?
must you be graying?
must they be graying? 	must I have grayed?
must you have grayed?
must he have grayed?
must we have grayed?
must you have grayed?
must they have grayed? 	must I have been graying?
must you have been graying?
must he have been graying?
must we have been graying?
must you have been graying?
must they have been graying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not gray?
must you not gray?
must he not gray?
must we not gray?
must you not gray?
must they not gray? 	must I not be graying?
must you not be graying?
must he not be graying?
must we not be graying?
must you not be graying?
must they not be graying? 	must I not have grayed?
must you not have grayed?
must he not have grayed?
must we not have grayed?
must you not have grayed?
must they not have grayed? 	must I not have been graying?
must you not have been graying?
must he not have been graying?
must we not have been graying?
must you not have been graying?
must they not have been graying?