I could drag you could drag she could drag we could drag you could drag they could drag
V-ing form
I could be dragging you could be dragging she could be dragging we could be dragging you could be dragging they could be dragging
Perfect
I could have dragged you could have dragged she could have dragged we could have dragged you could have dragged they could have dragged
V-ing perfect
I could have been dragging you could have been dragging she could have been dragging we could have been dragging you could have been dragging they could have been dragging
Negation
Simple form
I could not drag you could not drag she could not drag we could not drag you could not drag they could not drag
V-ing form
I could not be dragging you could not be dragging she could not be dragging we could not be dragging you could not be dragging they could not be dragging
Perfect
I could not have dragged you could not have dragged she could not have dragged we could not have dragged you could not have dragged they could not have dragged
V-ing perfect
I could not have been dragging you could not have been dragging she could not have been dragging we could not have been dragging you could not have been dragging they could not have been dragging
Interrogative form
Simple form
could I drag? could you drag? could she drag? could we drag? could you drag? could they drag?
V-ing form
could I be dragging? could you be dragging? could she be dragging? could we be dragging? could you be dragging? could they be dragging?
Perfect
could I have dragged? could you have dragged? could she have dragged? could we have dragged? could you have dragged? could they have dragged?
V-ing perfect
could I have been dragging? could you have been dragging? could she have been dragging? could we have been dragging? could you have been dragging? could they have been dragging?
Interro-negative form
Simple form
could I not drag? could you not drag? could she not drag? could we not drag? could you not drag? could they not drag?
V-ing form
could I not be dragging? could you not be dragging? could she not be dragging? could we not be dragging? could you not be dragging? could they not be dragging?
Perfect
could I not have dragged? could you not have dragged? could she not have dragged? could we not have dragged? could you not have dragged? could they not have dragged?
V-ing perfect
could I not have been dragging? could you not have been dragging? could she not have been dragging? could we not have been dragging? could you not have been dragging? could they not have been dragging?