must cog
Verbo regular: cog - coged- coged

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must cog
you must cog
he must cog
we must cog
you must cog
they must cog 	I must be coging
you must be coging
he must be coging
we must be coging
you must be coging
they must be coging	I must have coged
you must have coged
he must have coged
we must have coged
you must have coged
they must have coged	I must have been coging
you must have been coging
he must have been coging
we must have been coging
you must have been coging
they must have been coging	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't cog
you mustn't cog
he mustn't cog
we mustn't cog
you mustn't cog
they mustn't cog 	I mustn't be coging
you mustn't be coging
he mustn't be coging
we mustn't be coging
you mustn't be coging
they mustn't be coging	I mustn't have coged
you mustn't have coged
he mustn't have coged
we mustn't have coged
you mustn't have coged
they mustn't have coged	I mustn't have been coging
you mustn't have been coging
he mustn't have been coging
we mustn't have been coging
you mustn't have been coging
they mustn't have been coging	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I cog?
must you cog?
must he cog?
must we cog?
must you cog?
must they cog? 	must I be coging?
must you be coging?
must he be coging?
must we be coging?
must you be coging?
must they be coging? 	must I have coged?
must you have coged?
must he have coged?
must we have coged?
must you have coged?
must they have coged? 	must I have been coging?
must you have been coging?
must he have been coging?
must we have been coging?
must you have been coging?
must they have been coging? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I cog?
mustn't you cog?
mustn't he cog?
mustn't we cog?
mustn't you cog?
mustn't they cog? 	mustn't I be coging?
mustn't you be coging?
mustn't he be coging?
mustn't we be coging?
mustn't you be coging?
mustn't they be coging? 	mustn't I have coged?
mustn't you have coged?
mustn't he have coged?
mustn't we have coged?
mustn't you have coged?
mustn't they have coged? 	mustn't I have been coging?
mustn't you have been coging?
mustn't he have been coging?
mustn't we have been coging?
mustn't you have been coging?
mustn't they have been coging?