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