could bull
Regular verb: bull - bulled- bulled

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't bull
you couldn't bull
she couldn't bull
we couldn't bull
you couldn't bull
they couldn't bull 	I couldn't be bulling
you couldn't be bulling
she couldn't be bulling
we couldn't be bulling
you couldn't be bulling
they couldn't be bulling	I couldn't have bulled
you couldn't have bulled
she couldn't have bulled
we couldn't have bulled
you couldn't have bulled
they couldn't have bulled	I couldn't have been bulling
you couldn't have been bulling
she couldn't have been bulling
we couldn't have been bulling
you couldn't have been bulling
they couldn't have been bulling	

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

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