must keyboard
Verbo regular: keyboard - keyboarded- keyboarded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must keyboard
you must keyboard
he must keyboard
we must keyboard
you must keyboard
they must keyboard 	I must be keyboarding
you must be keyboarding
he must be keyboarding
we must be keyboarding
you must be keyboarding
they must be keyboarding	I must have keyboarded
you must have keyboarded
he must have keyboarded
we must have keyboarded
you must have keyboarded
they must have keyboarded	I must have been keyboarding
you must have been keyboarding
he must have been keyboarding
we must have been keyboarding
you must have been keyboarding
they must have been keyboarding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't keyboard
you mustn't keyboard
he mustn't keyboard
we mustn't keyboard
you mustn't keyboard
they mustn't keyboard 	I mustn't be keyboarding
you mustn't be keyboarding
he mustn't be keyboarding
we mustn't be keyboarding
you mustn't be keyboarding
they mustn't be keyboarding	I mustn't have keyboarded
you mustn't have keyboarded
he mustn't have keyboarded
we mustn't have keyboarded
you mustn't have keyboarded
they mustn't have keyboarded	I mustn't have been keyboarding
you mustn't have been keyboarding
he mustn't have been keyboarding
we mustn't have been keyboarding
you mustn't have been keyboarding
they mustn't have been keyboarding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I keyboard?
must you keyboard?
must he keyboard?
must we keyboard?
must you keyboard?
must they keyboard? 	must I be keyboarding?
must you be keyboarding?
must he be keyboarding?
must we be keyboarding?
must you be keyboarding?
must they be keyboarding? 	must I have keyboarded?
must you have keyboarded?
must he have keyboarded?
must we have keyboarded?
must you have keyboarded?
must they have keyboarded? 	must I have been keyboarding?
must you have been keyboarding?
must he have been keyboarding?
must we have been keyboarding?
must you have been keyboarding?
must they have been keyboarding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I keyboard?
mustn't you keyboard?
mustn't he keyboard?
mustn't we keyboard?
mustn't you keyboard?
mustn't they keyboard? 	mustn't I be keyboarding?
mustn't you be keyboarding?
mustn't he be keyboarding?
mustn't we be keyboarding?
mustn't you be keyboarding?
mustn't they be keyboarding? 	mustn't I have keyboarded?
mustn't you have keyboarded?
mustn't he have keyboarded?
mustn't we have keyboarded?
mustn't you have keyboarded?
mustn't they have keyboarded? 	mustn't I have been keyboarding?
mustn't you have been keyboarding?
mustn't he have been keyboarding?
mustn't we have been keyboarding?
mustn't you have been keyboarding?
mustn't they have been keyboarding?