I could bungle you could bungle she could bungle we could bungle you could bungle they could bungle
V-ing form
I could be bungling you could be bungling she could be bungling we could be bungling you could be bungling they could be bungling
Perfect
I could have bungled you could have bungled she 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 she 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 she 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 she 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 she 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 she 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 she bungle? could we bungle? could you bungle? could they bungle?
V-ing form
could I be bungling? could you be bungling? could she be bungling? could we be bungling? could you be bungling? could they be bungling?
Perfect
could I have bungled? could you have bungled? could she 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 she 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 she 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 she 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 she 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 she have been bungling? couldn't we have been bungling? couldn't you have been bungling? couldn't they have been bungling?