must coo
Verbo regular: coo - cooed- cooed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must coo
you must coo
he must coo
we must coo
you must coo
they must coo 	I must be cooing
you must be cooing
he must be cooing
we must be cooing
you must be cooing
they must be cooing	I must have cooed
you must have cooed
he must have cooed
we must have cooed
you must have cooed
they must have cooed	I must have been cooing
you must have been cooing
he must have been cooing
we must have been cooing
you must have been cooing
they must have been cooing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't coo
you mustn't coo
he mustn't coo
we mustn't coo
you mustn't coo
they mustn't coo 	I mustn't be cooing
you mustn't be cooing
he mustn't be cooing
we mustn't be cooing
you mustn't be cooing
they mustn't be cooing	I mustn't have cooed
you mustn't have cooed
he mustn't have cooed
we mustn't have cooed
you mustn't have cooed
they mustn't have cooed	I mustn't have been cooing
you mustn't have been cooing
he mustn't have been cooing
we mustn't have been cooing
you mustn't have been cooing
they mustn't have been cooing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I coo?
must you coo?
must he coo?
must we coo?
must you coo?
must they coo? 	must I be cooing?
must you be cooing?
must he be cooing?
must we be cooing?
must you be cooing?
must they be cooing? 	must I have cooed?
must you have cooed?
must he have cooed?
must we have cooed?
must you have cooed?
must they have cooed? 	must I have been cooing?
must you have been cooing?
must he have been cooing?
must we have been cooing?
must you have been cooing?
must they have been cooing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I coo?
mustn't you coo?
mustn't he coo?
mustn't we coo?
mustn't you coo?
mustn't they coo? 	mustn't I be cooing?
mustn't you be cooing?
mustn't he be cooing?
mustn't we be cooing?
mustn't you be cooing?
mustn't they be cooing? 	mustn't I have cooed?
mustn't you have cooed?
mustn't he have cooed?
mustn't we have cooed?
mustn't you have cooed?
mustn't they have cooed? 	mustn't I have been cooing?
mustn't you have been cooing?
mustn't he have been cooing?
mustn't we have been cooing?
mustn't you have been cooing?
mustn't they have been cooing?