I could sweep you could sweep he could sweep we could sweep you could sweep they could sweep
V-ing form
I could be sweeping you could be sweeping he could be sweeping we could be sweeping you could be sweeping they could be sweeping
Perfect
I could have swept you could have swept he could have swept we could have swept you could have swept they could have swept
V-ing perfect
I could have been sweeping you could have been sweeping he could have been sweeping we could have been sweeping you could have been sweeping they could have been sweeping
Negation
Simple form
I could not sweep you could not sweep he could not sweep we could not sweep you could not sweep they could not sweep
V-ing form
I could not be sweeping you could not be sweeping he could not be sweeping we could not be sweeping you could not be sweeping they could not be sweeping
Perfect
I could not have swept you could not have swept he could not have swept we could not have swept you could not have swept they could not have swept
V-ing perfect
I could not have been sweeping you could not have been sweeping he could not have been sweeping we could not have been sweeping you could not have been sweeping they could not have been sweeping
Interrogative form
Simple form
could I sweep? could you sweep? could he sweep? could we sweep? could you sweep? could they sweep?
V-ing form
could I be sweeping? could you be sweeping? could he be sweeping? could we be sweeping? could you be sweeping? could they be sweeping?
Perfect
could I have swept? could you have swept? could he have swept? could we have swept? could you have swept? could they have swept?
V-ing perfect
could I have been sweeping? could you have been sweeping? could he have been sweeping? could we have been sweeping? could you have been sweeping? could they have been sweeping?
Interro-negative form
Simple form
could I not sweep? could you not sweep? could he not sweep? could we not sweep? could you not sweep? could they not sweep?
V-ing form
could I not be sweeping? could you not be sweeping? could he not be sweeping? could we not be sweeping? could you not be sweeping? could they not be sweeping?
Perfect
could I not have swept? could you not have swept? could he not have swept? could we not have swept? could you not have swept? could they not have swept?
V-ing perfect
could I not have been sweeping? could you not have been sweeping? could he not have been sweeping? could we not have been sweeping? could you not have been sweeping? could they not have been sweeping?