I could bump-start you could bump-start he 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 he 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 he 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 he 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 couldn't bump-start you couldn't bump-start he couldn't bump-start we couldn't bump-start you couldn't bump-start they couldn't bump-start
V-ing form
I couldn't be bump-starting you couldn't be bump-starting he couldn't be bump-starting we couldn't be bump-starting you couldn't be bump-starting they couldn't be bump-starting
Perfect
I couldn't have bump-started you couldn't have bump-started he couldn't have bump-started we couldn't have bump-started you couldn't have bump-started they couldn't have bump-started
V-ing perfect
I couldn't have been bump-starting you couldn't have been bump-starting he couldn't have been bump-starting we couldn't have been bump-starting you couldn't have been bump-starting they couldn't have been bump-starting
Interrogative form
Simple form
could I bump-start? could you bump-start? could he 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 he 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 he 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 he 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
couldn't I bump-start? couldn't you bump-start? couldn't he bump-start? couldn't we bump-start? couldn't you bump-start? couldn't they bump-start?
V-ing form
couldn't I be bump-starting? couldn't you be bump-starting? couldn't he be bump-starting? couldn't we be bump-starting? couldn't you be bump-starting? couldn't they be bump-starting?
Perfect
couldn't I have bump-started? couldn't you have bump-started? couldn't he have bump-started? couldn't we have bump-started? couldn't you have bump-started? couldn't they have bump-started?
V-ing perfect
couldn't I have been bump-starting? couldn't you have been bump-starting? couldn't he have been bump-starting? couldn't we have been bump-starting? couldn't you have been bump-starting? couldn't they have been bump-starting?