English verb conjugation
COULD BULL

Regular verb: bull - bulled - bulled

Affirmation

Simple form	V-ing form
I could bull you could bull he could bull we could bull you could bull they could bull	I could be bulling you could be bulling he could be bulling we could be bulling you could be bulling they could be bulling
Perfect	V-ing perfect
I could have bulled you could have bulled he 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 he 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
I could not bull you could not bull he could not bull we could not bull you could not bull they could not bull	I could not be bulling you could not be bulling he could not be bulling we could not be bulling you could not be bulling they could not be bulling
Perfect	V-ing perfect
I could not have bulled you could not have bulled he could not have bulled we could not have bulled you could not have bulled they could not have bulled	I could not have been bulling you could not have been bulling he could not have been bulling we could not have been bulling you could not have been bulling they could not have been bulling

Interrogative form

Simple form	V-ing form
could I bull? could you bull? could he bull? could we bull? could you bull? could they bull?	could I be bulling? could you be bulling? could he be bulling? could we be bulling? could you be bulling? could they be bulling?
Perfect	V-ing perfect
could I have bulled? could you have bulled? could he 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 he 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
could I not bull? could you not bull? could he not bull? could we not bull? could you not bull? could they not bull?	could I not be bulling? could you not be bulling? could he not be bulling? could we not be bulling? could you not be bulling? could they not be bulling?
Perfect	V-ing perfect
could I not have bulled? could you not have bulled? could he not have bulled? could we not have bulled? could you not have bulled? could they not have bulled?	could I not have been bulling? could you not have been bulling? could he not have been bulling? could we not have been bulling? could you not have been bulling? could they not have been bulling?