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 couldn't blear you couldn't blear he couldn't blear we couldn't blear you couldn't blear they couldn't blear
V-ing form
I couldn't be blearing you couldn't be blearing he couldn't be blearing we couldn't be blearing you couldn't be blearing they couldn't be blearing
Perfect
I couldn't have bleared you couldn't have bleared he couldn't have bleared we couldn't have bleared you couldn't have bleared they couldn't have bleared
V-ing perfect
I couldn't have been blearing you couldn't have been blearing he couldn't have been blearing we couldn't have been blearing you couldn't have been blearing they couldn't 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
couldn't I blear? couldn't you blear? couldn't he blear? couldn't we blear? couldn't you blear? couldn't they blear?
V-ing form
couldn't I be blearing? couldn't you be blearing? couldn't he be blearing? couldn't we be blearing? couldn't you be blearing? couldn't they be blearing?
Perfect
couldn't I have bleared? couldn't you have bleared? couldn't he have bleared? couldn't we have bleared? couldn't you have bleared? couldn't they have bleared?
V-ing perfect
couldn't I have been blearing? couldn't you have been blearing? couldn't he have been blearing? couldn't we have been blearing? couldn't you have been blearing? couldn't they have been blearing?