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