English verb conjugation
COULD RACK

Regular verb: rack - racked - racked

Affirmation

Simple form	V-ing form
I could rack you could rack she could rack we could rack you could rack they could rack	I could be racking you could be racking she could be racking we could be racking you could be racking they could be racking
Perfect	V-ing perfect
I could have racked you could have racked she could have racked we could have racked you could have racked they could have racked	I could have been racking you could have been racking she could have been racking we could have been racking you could have been racking they could have been racking

Negation

Simple form	V-ing form
I could not rack you could not rack she could not rack we could not rack you could not rack they could not rack	I could not be racking you could not be racking she could not be racking we could not be racking you could not be racking they could not be racking
Perfect	V-ing perfect
I could not have racked you could not have racked she could not have racked we could not have racked you could not have racked they could not have racked	I could not have been racking you could not have been racking she could not have been racking we could not have been racking you could not have been racking they could not have been racking

Interrogative form

Simple form	V-ing form
could I rack? could you rack? could she rack? could we rack? could you rack? could they rack?	could I be racking? could you be racking? could she be racking? could we be racking? could you be racking? could they be racking?
Perfect	V-ing perfect
could I have racked? could you have racked? could she have racked? could we have racked? could you have racked? could they have racked?	could I have been racking? could you have been racking? could she have been racking? could we have been racking? could you have been racking? could they have been racking?

Interro-negative form

Simple form	V-ing form
could I not rack? could you not rack? could she not rack? could we not rack? could you not rack? could they not rack?	could I not be racking? could you not be racking? could she not be racking? could we not be racking? could you not be racking? could they not be racking?
Perfect	V-ing perfect
could I not have racked? could you not have racked? could she not have racked? could we not have racked? could you not have racked? could they not have racked?	could I not have been racking? could you not have been racking? could she not have been racking? could we not have been racking? could you not have been racking? could they not have been racking?