English verb conjugation
COULD RACK

Regular verb: rack - racked - racked

Affirmation

Simple form	V-ing form
I could rack you could rack he could rack we could rack you could rack they could rack	I could be racking you could be racking he 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 he 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 he 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 couldn't rack you couldn't rack he couldn't rack we couldn't rack you couldn't rack they couldn't rack	I couldn't be racking you couldn't be racking he couldn't be racking we couldn't be racking you couldn't be racking they couldn't be racking
Perfect	V-ing perfect
I couldn't have racked you couldn't have racked he couldn't have racked we couldn't have racked you couldn't have racked they couldn't have racked	I couldn't have been racking you couldn't have been racking he couldn't have been racking we couldn't have been racking you couldn't have been racking they couldn't have been racking

Interrogative form

Simple form	V-ing form
could I rack? could you rack? could he rack? could we rack? could you rack? could they rack?	could I be racking? could you be racking? could he 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 he 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 he 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
couldn't I rack? couldn't you rack? couldn't he rack? couldn't we rack? couldn't you rack? couldn't they rack?	couldn't I be racking? couldn't you be racking? couldn't he be racking? couldn't we be racking? couldn't you be racking? couldn't they be racking?
Perfect	V-ing perfect
couldn't I have racked? couldn't you have racked? couldn't he have racked? couldn't we have racked? couldn't you have racked? couldn't they have racked?	couldn't I have been racking? couldn't you have been racking? couldn't he have been racking? couldn't we have been racking? couldn't you have been racking? couldn't they have been racking?