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