I could bump-start you could bump-start she could bump-start we could bump-start you could bump-start they could bump-start
V-ing form
I could be bump-starting you could be bump-starting she could be bump-starting we could be bump-starting you could be bump-starting they could be bump-starting
Perfect
I could have bump-started you could have bump-started she could have bump-started we could have bump-started you could have bump-started they could have bump-started
V-ing perfect
I could have been bump-starting you could have been bump-starting she could have been bump-starting we could have been bump-starting you could have been bump-starting they could have been bump-starting
Negation
Simple form
I could not bump-start you could not bump-start she could not bump-start we could not bump-start you could not bump-start they could not bump-start
V-ing form
I could not be bump-starting you could not be bump-starting she could not be bump-starting we could not be bump-starting you could not be bump-starting they could not be bump-starting
Perfect
I could not have bump-started you could not have bump-started she could not have bump-started we could not have bump-started you could not have bump-started they could not have bump-started
V-ing perfect
I could not have been bump-starting you could not have been bump-starting she could not have been bump-starting we could not have been bump-starting you could not have been bump-starting they could not have been bump-starting
Interrogative form
Simple form
could I bump-start? could you bump-start? could she bump-start? could we bump-start? could you bump-start? could they bump-start?
V-ing form
could I be bump-starting? could you be bump-starting? could she be bump-starting? could we be bump-starting? could you be bump-starting? could they be bump-starting?
Perfect
could I have bump-started? could you have bump-started? could she have bump-started? could we have bump-started? could you have bump-started? could they have bump-started?
V-ing perfect
could I have been bump-starting? could you have been bump-starting? could she have been bump-starting? could we have been bump-starting? could you have been bump-starting? could they have been bump-starting?
Interro-negative form
Simple form
could I not bump-start? could you not bump-start? could she not bump-start? could we not bump-start? could you not bump-start? could they not bump-start?
V-ing form
could I not be bump-starting? could you not be bump-starting? could she not be bump-starting? could we not be bump-starting? could you not be bump-starting? could they not be bump-starting?
Perfect
could I not have bump-started? could you not have bump-started? could she not have bump-started? could we not have bump-started? could you not have bump-started? could they not have bump-started?
V-ing perfect
could I not have been bump-starting? could you not have been bump-starting? could she not have been bump-starting? could we not have been bump-starting? could you not have been bump-starting? could they not have been bump-starting?