I could retake you could retake she could retake we could retake you could retake they could retake
V-ing form
I could be retaking you could be retaking she could be retaking we could be retaking you could be retaking they could be retaking
Perfect
I could have retaken you could have retaken she could have retaken we could have retaken you could have retaken they could have retaken
V-ing perfect
I could have been retaking you could have been retaking she could have been retaking we could have been retaking you could have been retaking they could have been retaking
Negation
Simple form
I couldn't retake you couldn't retake she couldn't retake we couldn't retake you couldn't retake they couldn't retake
V-ing form
I couldn't be retaking you couldn't be retaking she couldn't be retaking we couldn't be retaking you couldn't be retaking they couldn't be retaking
Perfect
I couldn't have retaken you couldn't have retaken she couldn't have retaken we couldn't have retaken you couldn't have retaken they couldn't have retaken
V-ing perfect
I couldn't have been retaking you couldn't have been retaking she couldn't have been retaking we couldn't have been retaking you couldn't have been retaking they couldn't have been retaking
Interrogative form
Simple form
could I retake? could you retake? could she retake? could we retake? could you retake? could they retake?
V-ing form
could I be retaking? could you be retaking? could she be retaking? could we be retaking? could you be retaking? could they be retaking?
Perfect
could I have retaken? could you have retaken? could she have retaken? could we have retaken? could you have retaken? could they have retaken?
V-ing perfect
could I have been retaking? could you have been retaking? could she have been retaking? could we have been retaking? could you have been retaking? could they have been retaking?
Interro-negative form
Simple form
couldn't I retake? couldn't you retake? couldn't she retake? couldn't we retake? couldn't you retake? couldn't they retake?
V-ing form
couldn't I be retaking? couldn't you be retaking? couldn't she be retaking? couldn't we be retaking? couldn't you be retaking? couldn't they be retaking?
Perfect
couldn't I have retaken? couldn't you have retaken? couldn't she have retaken? couldn't we have retaken? couldn't you have retaken? couldn't they have retaken?
V-ing perfect
couldn't I have been retaking? couldn't you have been retaking? couldn't she have been retaking? couldn't we have been retaking? couldn't you have been retaking? couldn't they have been retaking?