I could shade you could shade she could shade we could shade you could shade they could shade
V-ing form
I could be shading you could be shading she could be shading we could be shading you could be shading they could be shading
Perfect
I could have shaded you could have shaded she could have shaded we could have shaded you could have shaded they could have shaded
V-ing perfect
I could have been shading you could have been shading she could have been shading we could have been shading you could have been shading they could have been shading
Negation
Simple form
I could not shade you could not shade she could not shade we could not shade you could not shade they could not shade
V-ing form
I could not be shading you could not be shading she could not be shading we could not be shading you could not be shading they could not be shading
Perfect
I could not have shaded you could not have shaded she could not have shaded we could not have shaded you could not have shaded they could not have shaded
V-ing perfect
I could not have been shading you could not have been shading she could not have been shading we could not have been shading you could not have been shading they could not have been shading
Interrogative form
Simple form
could I shade? could you shade? could she shade? could we shade? could you shade? could they shade?
V-ing form
could I be shading? could you be shading? could she be shading? could we be shading? could you be shading? could they be shading?
Perfect
could I have shaded? could you have shaded? could she have shaded? could we have shaded? could you have shaded? could they have shaded?
V-ing perfect
could I have been shading? could you have been shading? could she have been shading? could we have been shading? could you have been shading? could they have been shading?
Interro-negative form
Simple form
could I not shade? could you not shade? could she not shade? could we not shade? could you not shade? could they not shade?
V-ing form
could I not be shading? could you not be shading? could she not be shading? could we not be shading? could you not be shading? could they not be shading?
Perfect
could I not have shaded? could you not have shaded? could she not have shaded? could we not have shaded? could you not have shaded? could they not have shaded?
V-ing perfect
could I not have been shading? could you not have been shading? could she not have been shading? could we not have been shading? could you not have been shading? could they not have been shading?