I could shoe you could shoe he could shoe we could shoe you could shoe they could shoe
V-ing form
I could be shoing you could be shoing he could be shoing we could be shoing you could be shoing they could be shoing
Perfect
I could have shod, shoed you could have shod, shoed he could have shod, shoed we could have shod, shoed you could have shod, shoed they could have shod, shoed
V-ing perfect
I could have been shoing you could have been shoing he could have been shoing we could have been shoing you could have been shoing they could have been shoing
Negation
Simple form
I couldn't shoe you couldn't shoe he couldn't shoe we couldn't shoe you couldn't shoe they couldn't shoe
V-ing form
I couldn't be shoing you couldn't be shoing he couldn't be shoing we couldn't be shoing you couldn't be shoing they couldn't be shoing
Perfect
I couldn't have shod, shoed you couldn't have shod, shoed he couldn't have shod, shoed we couldn't have shod, shoed you couldn't have shod, shoed they couldn't have shod, shoed
V-ing perfect
I couldn't have been shoing you couldn't have been shoing he couldn't have been shoing we couldn't have been shoing you couldn't have been shoing they couldn't have been shoing
Interrogative form
Simple form
could I shoe? could you shoe? could he shoe? could we shoe? could you shoe? could they shoe?
V-ing form
could I be shoing? could you be shoing? could he be shoing? could we be shoing? could you be shoing? could they be shoing?
Perfect
could I have shod, shoed? could you have shod, shoed? could he have shod, shoed? could we have shod, shoed? could you have shod, shoed? could they have shod, shoed?
V-ing perfect
could I have been shoing? could you have been shoing? could he have been shoing? could we have been shoing? could you have been shoing? could they have been shoing?
Interro-negative form
Simple form
couldn't I shoe? couldn't you shoe? couldn't he shoe? couldn't we shoe? couldn't you shoe? couldn't they shoe?
V-ing form
couldn't I be shoing? couldn't you be shoing? couldn't he be shoing? couldn't we be shoing? couldn't you be shoing? couldn't they be shoing?
Perfect
couldn't I have shod, shoed? couldn't you have shod, shoed? couldn't he have shod, shoed? couldn't we have shod, shoed? couldn't you have shod, shoed? couldn't they have shod, shoed?
V-ing perfect
couldn't I have been shoing? couldn't you have been shoing? couldn't he have been shoing? couldn't we have been shoing? couldn't you have been shoing? couldn't they have been shoing?