I could blear you could blear he could blear we could blear you could blear they could blear
V-ing form
I could be blearing you could be blearing he could be blearing we could be blearing you could be blearing they could be blearing
Perfect
I could have bleared you could have bleared he could have bleared we could have bleared you could have bleared they could have bleared
V-ing perfect
I could have been blearing you could have been blearing he could have been blearing we could have been blearing you could have been blearing they could have been blearing
Negation
Simple form
I could not blear you could not blear he could not blear we could not blear you could not blear they could not blear
V-ing form
I could not be blearing you could not be blearing he could not be blearing we could not be blearing you could not be blearing they could not be blearing
Perfect
I could not have bleared you could not have bleared he could not have bleared we could not have bleared you could not have bleared they could not have bleared
V-ing perfect
I could not have been blearing you could not have been blearing he could not have been blearing we could not have been blearing you could not have been blearing they could not have been blearing
Interrogative form
Simple form
could I blear? could you blear? could he blear? could we blear? could you blear? could they blear?
V-ing form
could I be blearing? could you be blearing? could he be blearing? could we be blearing? could you be blearing? could they be blearing?
Perfect
could I have bleared? could you have bleared? could he have bleared? could we have bleared? could you have bleared? could they have bleared?
V-ing perfect
could I have been blearing? could you have been blearing? could he have been blearing? could we have been blearing? could you have been blearing? could they have been blearing?
Interro-negative form
Simple form
could I not blear? could you not blear? could he not blear? could we not blear? could you not blear? could they not blear?
V-ing form
could I not be blearing? could you not be blearing? could he not be blearing? could we not be blearing? could you not be blearing? could they not be blearing?
Perfect
could I not have bleared? could you not have bleared? could he not have bleared? could we not have bleared? could you not have bleared? could they not have bleared?
V-ing perfect
could I not have been blearing? could you not have been blearing? could he not have been blearing? could we not have been blearing? could you not have been blearing? could they not have been blearing?