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