English verb conjugation
COULD BLACK

Regular verb: black - blacked - blacked

Affirmation

Simple form	V-ing form
I could black you could black he could black we could black you could black they could black	I could be blacking you could be blacking he could be blacking we could be blacking you could be blacking they could be blacking
Perfect	V-ing perfect
I could have blacked you could have blacked he could have blacked we could have blacked you could have blacked they could have blacked	I could have been blacking you could have been blacking he could have been blacking we could have been blacking you could have been blacking they could have been blacking

Negation

Simple form	V-ing form
I could not black you could not black he could not black we could not black you could not black they could not black	I could not be blacking you could not be blacking he could not be blacking we could not be blacking you could not be blacking they could not be blacking
Perfect	V-ing perfect
I could not have blacked you could not have blacked he could not have blacked we could not have blacked you could not have blacked they could not have blacked	I could not have been blacking you could not have been blacking he could not have been blacking we could not have been blacking you could not have been blacking they could not have been blacking

Interrogative form

Simple form	V-ing form
could I black? could you black? could he black? could we black? could you black? could they black?	could I be blacking? could you be blacking? could he be blacking? could we be blacking? could you be blacking? could they be blacking?
Perfect	V-ing perfect
could I have blacked? could you have blacked? could he have blacked? could we have blacked? could you have blacked? could they have blacked?	could I have been blacking? could you have been blacking? could he have been blacking? could we have been blacking? could you have been blacking? could they have been blacking?

Interro-negative form

Simple form	V-ing form
could I not black? could you not black? could he not black? could we not black? could you not black? could they not black?	could I not be blacking? could you not be blacking? could he not be blacking? could we not be blacking? could you not be blacking? could they not be blacking?
Perfect	V-ing perfect
could I not have blacked? could you not have blacked? could he not have blacked? could we not have blacked? could you not have blacked? could they not have blacked?	could I not have been blacking? could you not have been blacking? could he not have been blacking? could we not have been blacking? could you not have been blacking? could they not have been blacking?