I could implement you could implement she could implement we could implement you could implement they could implement
V-ing form
I could be implementing you could be implementing she could be implementing we could be implementing you could be implementing they could be implementing
Perfect
I could have implemented you could have implemented she could have implemented we could have implemented you could have implemented they could have implemented
V-ing perfect
I could have been implementing you could have been implementing she could have been implementing we could have been implementing you could have been implementing they could have been implementing
Negation
Simple form
I could not implement you could not implement she could not implement we could not implement you could not implement they could not implement
V-ing form
I could not be implementing you could not be implementing she could not be implementing we could not be implementing you could not be implementing they could not be implementing
Perfect
I could not have implemented you could not have implemented she could not have implemented we could not have implemented you could not have implemented they could not have implemented
V-ing perfect
I could not have been implementing you could not have been implementing she could not have been implementing we could not have been implementing you could not have been implementing they could not have been implementing
Interrogative form
Simple form
could I implement? could you implement? could she implement? could we implement? could you implement? could they implement?
V-ing form
could I be implementing? could you be implementing? could she be implementing? could we be implementing? could you be implementing? could they be implementing?
Perfect
could I have implemented? could you have implemented? could she have implemented? could we have implemented? could you have implemented? could they have implemented?
V-ing perfect
could I have been implementing? could you have been implementing? could she have been implementing? could we have been implementing? could you have been implementing? could they have been implementing?
Interro-negative form
Simple form
could I not implement? could you not implement? could she not implement? could we not implement? could you not implement? could they not implement?
V-ing form
could I not be implementing? could you not be implementing? could she not be implementing? could we not be implementing? could you not be implementing? could they not be implementing?
Perfect
could I not have implemented? could you not have implemented? could she not have implemented? could we not have implemented? could you not have implemented? could they not have implemented?
V-ing perfect
could I not have been implementing? could you not have been implementing? could she not have been implementing? could we not have been implementing? could you not have been implementing? could they not have been implementing?