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 couldn't bulldog you couldn't bulldog she couldn't bulldog we couldn't bulldog you couldn't bulldog they couldn't bulldog
V-ing form
I couldn't be bulldoging you couldn't be bulldoging she couldn't be bulldoging we couldn't be bulldoging you couldn't be bulldoging they couldn't be bulldoging
Perfect
I couldn't have bulldoged you couldn't have bulldoged she couldn't have bulldoged we couldn't have bulldoged you couldn't have bulldoged they couldn't have bulldoged
V-ing perfect
I couldn't have been bulldoging you couldn't have been bulldoging she couldn't have been bulldoging we couldn't have been bulldoging you couldn't have been bulldoging they couldn't 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
couldn't I bulldog? couldn't you bulldog? couldn't she bulldog? couldn't we bulldog? couldn't you bulldog? couldn't they bulldog?
V-ing form
couldn't I be bulldoging? couldn't you be bulldoging? couldn't she be bulldoging? couldn't we be bulldoging? couldn't you be bulldoging? couldn't they be bulldoging?
Perfect
couldn't I have bulldoged? couldn't you have bulldoged? couldn't she have bulldoged? couldn't we have bulldoged? couldn't you have bulldoged? couldn't they have bulldoged?
V-ing perfect
couldn't I have been bulldoging? couldn't you have been bulldoging? couldn't she have been bulldoging? couldn't we have been bulldoging? couldn't you have been bulldoging? couldn't they have been bulldoging?