English verb conjugation
COULD BUCK

Regular verb: buck - bucked - bucked

Affirmation

Simple form	V-ing form
I could buck you could buck she could buck we could buck you could buck they could buck	I could be bucking you could be bucking she could be bucking we could be bucking you could be bucking they could be bucking
Perfect	V-ing perfect
I could have bucked you could have bucked she could have bucked we could have bucked you could have bucked they could have bucked	I could have been bucking you could have been bucking she could have been bucking we could have been bucking you could have been bucking they could have been bucking

Negation

Simple form	V-ing form
I could not buck you could not buck she could not buck we could not buck you could not buck they could not buck	I could not be bucking you could not be bucking she could not be bucking we could not be bucking you could not be bucking they could not be bucking
Perfect	V-ing perfect
I could not have bucked you could not have bucked she could not have bucked we could not have bucked you could not have bucked they could not have bucked	I could not have been bucking you could not have been bucking she could not have been bucking we could not have been bucking you could not have been bucking they could not have been bucking

Interrogative form

Simple form	V-ing form
could I buck? could you buck? could she buck? could we buck? could you buck? could they buck?	could I be bucking? could you be bucking? could she be bucking? could we be bucking? could you be bucking? could they be bucking?
Perfect	V-ing perfect
could I have bucked? could you have bucked? could she have bucked? could we have bucked? could you have bucked? could they have bucked?	could I have been bucking? could you have been bucking? could she have been bucking? could we have been bucking? could you have been bucking? could they have been bucking?

Interro-negative form

Simple form	V-ing form
could I not buck? could you not buck? could she not buck? could we not buck? could you not buck? could they not buck?	could I not be bucking? could you not be bucking? could she not be bucking? could we not be bucking? could you not be bucking? could they not be bucking?
Perfect	V-ing perfect
could I not have bucked? could you not have bucked? could she not have bucked? could we not have bucked? could you not have bucked? could they not have bucked?	could I not have been bucking? could you not have been bucking? could she not have been bucking? could we not have been bucking? could you not have been bucking? could they not have been bucking?