must bull
Regular verb: bull - bulled- bulled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must bull
you must bull
she must bull
we must bull
you must bull
they must bull 	I must be bulling
you must be bulling
she must be bulling
we must be bulling
you must be bulling
they must be bulling	I must have bulled
you must have bulled
she 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
she must have been bulling
we must have been bulling
you must have been bulling
they must have been bulling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not bull
you must not bull
she must not bull
we must not bull
you must not bull
they must not bull 	I must not be bulling
you must not be bulling
she must not be bulling
we must not be bulling
you must not be bulling
they must not be bulling	I must not have bulled
you must not have bulled
she must not have bulled
we must not have bulled
you must not have bulled
they must not have bulled	I must not have been bulling
you must not have been bulling
she must not have been bulling
we must not have been bulling
you must not have been bulling
they must not have been bulling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I bull?
must you bull?
must she bull?
must we bull?
must you bull?
must they bull? 	must I be bulling?
must you be bulling?
must she be bulling?
must we be bulling?
must you be bulling?
must they be bulling? 	must I have bulled?
must you have bulled?
must she 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 she have been bulling?
must we have been bulling?
must you have been bulling?
must they have been bulling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not bull?
must you not bull?
must she not bull?
must we not bull?
must you not bull?
must they not bull? 	must I not be bulling?
must you not be bulling?
must she not be bulling?
must we not be bulling?
must you not be bulling?
must they not be bulling? 	must I not have bulled?
must you not have bulled?
must she not have bulled?
must we not have bulled?
must you not have bulled?
must they not have bulled? 	must I not have been bulling?
must you not have been bulling?
must she not have been bulling?
must we not have been bulling?
must you not have been bulling?
must they not have been bulling?