I could bugle you could bugle she could bugle we could bugle you could bugle they could bugle
V-ing form
I could be bugling you could be bugling she could be bugling we could be bugling you could be bugling they could be bugling
Perfect
I could have bugled you could have bugled she could have bugled we could have bugled you could have bugled they could have bugled
V-ing perfect
I could have been bugling you could have been bugling she could have been bugling we could have been bugling you could have been bugling they could have been bugling
Negation
Simple form
I could not bugle you could not bugle she could not bugle we could not bugle you could not bugle they could not bugle
V-ing form
I could not be bugling you could not be bugling she could not be bugling we could not be bugling you could not be bugling they could not be bugling
Perfect
I could not have bugled you could not have bugled she could not have bugled we could not have bugled you could not have bugled they could not have bugled
V-ing perfect
I could not have been bugling you could not have been bugling she could not have been bugling we could not have been bugling you could not have been bugling they could not have been bugling
Interrogative form
Simple form
could I bugle? could you bugle? could she bugle? could we bugle? could you bugle? could they bugle?
V-ing form
could I be bugling? could you be bugling? could she be bugling? could we be bugling? could you be bugling? could they be bugling?
Perfect
could I have bugled? could you have bugled? could she have bugled? could we have bugled? could you have bugled? could they have bugled?
V-ing perfect
could I have been bugling? could you have been bugling? could she have been bugling? could we have been bugling? could you have been bugling? could they have been bugling?
Interro-negative form
Simple form
could I not bugle? could you not bugle? could she not bugle? could we not bugle? could you not bugle? could they not bugle?
V-ing form
could I not be bugling? could you not be bugling? could she not be bugling? could we not be bugling? could you not be bugling? could they not be bugling?
Perfect
could I not have bugled? could you not have bugled? could she not have bugled? could we not have bugled? could you not have bugled? could they not have bugled?
V-ing perfect
could I not have been bugling? could you not have been bugling? could she not have been bugling? could we not have been bugling? could you not have been bugling? could they not have been bugling?