I could bulldog you could bulldog she could bulldog we could bulldog you could bulldog they could bulldog
V-ing form
I could be bulldoging you could be bulldoging she could be bulldoging we could be bulldoging you could be bulldoging they could be bulldoging
Perfect
I could have bulldoged you could have bulldoged she could have bulldoged we could have bulldoged you could have bulldoged they could have bulldoged
V-ing perfect
I could have been bulldoging you could have been bulldoging she could have been bulldoging we could have been bulldoging you could have been bulldoging they could have been bulldoging
Negation
Simple form
I could not bulldog you could not bulldog she could not bulldog we could not bulldog you could not bulldog they could not bulldog
V-ing form
I could not be bulldoging you could not be bulldoging she could not be bulldoging we could not be bulldoging you could not be bulldoging they could not be bulldoging
Perfect
I could not have bulldoged you could not have bulldoged she could not have bulldoged we could not have bulldoged you could not have bulldoged they could not have bulldoged
V-ing perfect
I could not have been bulldoging you could not have been bulldoging she could not have been bulldoging we could not have been bulldoging you could not have been bulldoging they could not have been bulldoging
Interrogative form
Simple form
could I bulldog? could you bulldog? could she bulldog? could we bulldog? could you bulldog? could they bulldog?
V-ing form
could I be bulldoging? could you be bulldoging? could she be bulldoging? could we be bulldoging? could you be bulldoging? could they be bulldoging?
Perfect
could I have bulldoged? could you have bulldoged? could she have bulldoged? could we have bulldoged? could you have bulldoged? could they have bulldoged?
V-ing perfect
could I have been bulldoging? could you have been bulldoging? could she have been bulldoging? could we have been bulldoging? could you have been bulldoging? could they have been bulldoging?
Interro-negative form
Simple form
could I not bulldog? could you not bulldog? could she not bulldog? could we not bulldog? could you not bulldog? could they not bulldog?
V-ing form
could I not be bulldoging? could you not be bulldoging? could she not be bulldoging? could we not be bulldoging? could you not be bulldoging? could they not be bulldoging?
Perfect
could I not have bulldoged? could you not have bulldoged? could she not have bulldoged? could we not have bulldoged? could you not have bulldoged? could they not have bulldoged?
V-ing perfect
could I not have been bulldoging? could you not have been bulldoging? could she not have been bulldoging? could we not have been bulldoging? could you not have been bulldoging? could they not have been bulldoging?