I could bridge you could bridge he could bridge we could bridge you could bridge they could bridge
V-ing form
I could be bridging you could be bridging he could be bridging we could be bridging you could be bridging they could be bridging
Perfect
I could have bridged you could have bridged he could have bridged we could have bridged you could have bridged they could have bridged
V-ing perfect
I could have been bridging you could have been bridging he could have been bridging we could have been bridging you could have been bridging they could have been bridging
Negation
Simple form
I couldn't bridge you couldn't bridge he couldn't bridge we couldn't bridge you couldn't bridge they couldn't bridge
V-ing form
I couldn't be bridging you couldn't be bridging he couldn't be bridging we couldn't be bridging you couldn't be bridging they couldn't be bridging
Perfect
I couldn't have bridged you couldn't have bridged he couldn't have bridged we couldn't have bridged you couldn't have bridged they couldn't have bridged
V-ing perfect
I couldn't have been bridging you couldn't have been bridging he couldn't have been bridging we couldn't have been bridging you couldn't have been bridging they couldn't have been bridging
Interrogative form
Simple form
could I bridge? could you bridge? could he bridge? could we bridge? could you bridge? could they bridge?
V-ing form
could I be bridging? could you be bridging? could he be bridging? could we be bridging? could you be bridging? could they be bridging?
Perfect
could I have bridged? could you have bridged? could he have bridged? could we have bridged? could you have bridged? could they have bridged?
V-ing perfect
could I have been bridging? could you have been bridging? could he have been bridging? could we have been bridging? could you have been bridging? could they have been bridging?
Interro-negative form
Simple form
couldn't I bridge? couldn't you bridge? couldn't he bridge? couldn't we bridge? couldn't you bridge? couldn't they bridge?
V-ing form
couldn't I be bridging? couldn't you be bridging? couldn't he be bridging? couldn't we be bridging? couldn't you be bridging? couldn't they be bridging?
Perfect
couldn't I have bridged? couldn't you have bridged? couldn't he have bridged? couldn't we have bridged? couldn't you have bridged? couldn't they have bridged?
V-ing perfect
couldn't I have been bridging? couldn't you have been bridging? couldn't he have been bridging? couldn't we have been bridging? couldn't you have been bridging? couldn't they have been bridging?