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