must bull
Verbo regular: bull - bulled- bulled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must bull
you must bull
he must bull
we must bull
you must bull
they must bull 	I must be bulling
you must be bulling
he must be bulling
we must be bulling
you must be bulling
they must be bulling	I must have bulled
you must have bulled
he must have bulled
we must have bulled
you must have bulled
they must have bulled	I must have been bulling
you must have been bulling
he must have been bulling
we must have been bulling
you must have been bulling
they must have been bulling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't bull
you mustn't bull
he mustn't bull
we mustn't bull
you mustn't bull
they mustn't bull 	I mustn't be bulling
you mustn't be bulling
he mustn't be bulling
we mustn't be bulling
you mustn't be bulling
they mustn't be bulling	I mustn't have bulled
you mustn't have bulled
he mustn't have bulled
we mustn't have bulled
you mustn't have bulled
they mustn't have bulled	I mustn't have been bulling
you mustn't have been bulling
he mustn't have been bulling
we mustn't have been bulling
you mustn't have been bulling
they mustn't have been bulling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I bull?
must you bull?
must he bull?
must we bull?
must you bull?
must they bull? 	must I be bulling?
must you be bulling?
must he be bulling?
must we be bulling?
must you be bulling?
must they be bulling? 	must I have bulled?
must you have bulled?
must he have bulled?
must we have bulled?
must you have bulled?
must they have bulled? 	must I have been bulling?
must you have been bulling?
must he have been bulling?
must we have been bulling?
must you have been bulling?
must they have been bulling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I bull?
mustn't you bull?
mustn't he bull?
mustn't we bull?
mustn't you bull?
mustn't they bull? 	mustn't I be bulling?
mustn't you be bulling?
mustn't he be bulling?
mustn't we be bulling?
mustn't you be bulling?
mustn't they be bulling? 	mustn't I have bulled?
mustn't you have bulled?
mustn't he have bulled?
mustn't we have bulled?
mustn't you have bulled?
mustn't they have bulled? 	mustn't I have been bulling?
mustn't you have been bulling?
mustn't he have been bulling?
mustn't we have been bulling?
mustn't you have been bulling?
mustn't they have been bulling?