I could bugle you could bugle he could bugle we could bugle you could bugle they could bugle
V-ing form
I could be bugling you could be bugling he could be bugling we could be bugling you could be bugling they could be bugling
Perfect
I could have bugled you could have bugled he 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 he could have been bugling we could have been bugling you could have been bugling they could have been bugling
Negation
Simple form
I couldn't bugle you couldn't bugle he couldn't bugle we couldn't bugle you couldn't bugle they couldn't bugle
V-ing form
I couldn't be bugling you couldn't be bugling he couldn't be bugling we couldn't be bugling you couldn't be bugling they couldn't be bugling
Perfect
I couldn't have bugled you couldn't have bugled he couldn't have bugled we couldn't have bugled you couldn't have bugled they couldn't have bugled
V-ing perfect
I couldn't have been bugling you couldn't have been bugling he couldn't have been bugling we couldn't have been bugling you couldn't have been bugling they couldn't have been bugling
Interrogative form
Simple form
could I bugle? could you bugle? could he bugle? could we bugle? could you bugle? could they bugle?
V-ing form
could I be bugling? could you be bugling? could he be bugling? could we be bugling? could you be bugling? could they be bugling?
Perfect
could I have bugled? could you have bugled? could he 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 he have been bugling? could we have been bugling? could you have been bugling? could they have been bugling?
Interro-negative form
Simple form
couldn't I bugle? couldn't you bugle? couldn't he bugle? couldn't we bugle? couldn't you bugle? couldn't they bugle?
V-ing form
couldn't I be bugling? couldn't you be bugling? couldn't he be bugling? couldn't we be bugling? couldn't you be bugling? couldn't they be bugling?
Perfect
couldn't I have bugled? couldn't you have bugled? couldn't he have bugled? couldn't we have bugled? couldn't you have bugled? couldn't they have bugled?
V-ing perfect
couldn't I have been bugling? couldn't you have been bugling? couldn't he have been bugling? couldn't we have been bugling? couldn't you have been bugling? couldn't they have been bugling?