I could shear you could shear he could shear we could shear you could shear they could shear
V-ing form
I could be shearing you could be shearing he could be shearing we could be shearing you could be shearing they could be shearing
Perfect
I could have sheared, shorn you could have sheared, shorn he could have sheared, shorn we could have sheared, shorn you could have sheared, shorn they could have sheared, shorn
V-ing perfect
I could have been shearing you could have been shearing he could have been shearing we could have been shearing you could have been shearing they could have been shearing
Negation
Simple form
I couldn't shear you couldn't shear he couldn't shear we couldn't shear you couldn't shear they couldn't shear
V-ing form
I couldn't be shearing you couldn't be shearing he couldn't be shearing we couldn't be shearing you couldn't be shearing they couldn't be shearing
Perfect
I couldn't have sheared, shorn you couldn't have sheared, shorn he couldn't have sheared, shorn we couldn't have sheared, shorn you couldn't have sheared, shorn they couldn't have sheared, shorn
V-ing perfect
I couldn't have been shearing you couldn't have been shearing he couldn't have been shearing we couldn't have been shearing you couldn't have been shearing they couldn't have been shearing
Interrogative form
Simple form
could I shear? could you shear? could he shear? could we shear? could you shear? could they shear?
V-ing form
could I be shearing? could you be shearing? could he be shearing? could we be shearing? could you be shearing? could they be shearing?
Perfect
could I have sheared, shorn? could you have sheared, shorn? could he have sheared, shorn? could we have sheared, shorn? could you have sheared, shorn? could they have sheared, shorn?
V-ing perfect
could I have been shearing? could you have been shearing? could he have been shearing? could we have been shearing? could you have been shearing? could they have been shearing?
Interro-negative form
Simple form
couldn't I shear? couldn't you shear? couldn't he shear? couldn't we shear? couldn't you shear? couldn't they shear?
V-ing form
couldn't I be shearing? couldn't you be shearing? couldn't he be shearing? couldn't we be shearing? couldn't you be shearing? couldn't they be shearing?
Perfect
couldn't I have sheared, shorn? couldn't you have sheared, shorn? couldn't he have sheared, shorn? couldn't we have sheared, shorn? couldn't you have sheared, shorn? couldn't they have sheared, shorn?
V-ing perfect
couldn't I have been shearing? couldn't you have been shearing? couldn't he have been shearing? couldn't we have been shearing? couldn't you have been shearing? couldn't they have been shearing?