Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could plead plead you could plead plead he could plead plead we could plead plead you could plead plead they could plead plead
V-ing form
I could be plead pleading you could be plead pleading he could be plead pleading we could be plead pleading you could be plead pleading they could be plead pleading
Perfect
I could have plead pleaded you could have plead pleaded he could have plead pleaded we could have plead pleaded you could have plead pleaded they could have plead pleaded
V-ing perfect
I could have been plead pleading you could have been plead pleading he could have been plead pleading we could have been plead pleading you could have been plead pleading they could have been plead pleading
Negation
Simple form
I couldn't plead plead you couldn't plead plead he couldn't plead plead we couldn't plead plead you couldn't plead plead they couldn't plead plead
V-ing form
I couldn't be plead pleading you couldn't be plead pleading he couldn't be plead pleading we couldn't be plead pleading you couldn't be plead pleading they couldn't be plead pleading
Perfect
I couldn't have plead pleaded you couldn't have plead pleaded he couldn't have plead pleaded we couldn't have plead pleaded you couldn't have plead pleaded they couldn't have plead pleaded
V-ing perfect
I couldn't have been plead pleading you couldn't have been plead pleading he couldn't have been plead pleading we couldn't have been plead pleading you couldn't have been plead pleading they couldn't have been plead pleading
Interrogative form
Simple form
could I plead plead? could you plead plead? could he plead plead? could we plead plead? could you plead plead? could they plead plead?
V-ing form
could I be plead pleading? could you be plead pleading? could he be plead pleading? could we be plead pleading? could you be plead pleading? could they be plead pleading?
Perfect
could I have plead pleaded? could you have plead pleaded? could he have plead pleaded? could we have plead pleaded? could you have plead pleaded? could they have plead pleaded?
V-ing perfect
could I have been plead pleading? could you have been plead pleading? could he have been plead pleading? could we have been plead pleading? could you have been plead pleading? could they have been plead pleading?
Interro-negative form
Simple form
couldn't I plead plead? couldn't you plead plead? couldn't he plead plead? couldn't we plead plead? couldn't you plead plead? couldn't they plead plead?
V-ing form
couldn't I be plead pleading? couldn't you be plead pleading? couldn't he be plead pleading? couldn't we be plead pleading? couldn't you be plead pleading? couldn't they be plead pleading?
Perfect
couldn't I have plead pleaded? couldn't you have plead pleaded? couldn't he have plead pleaded? couldn't we have plead pleaded? couldn't you have plead pleaded? couldn't they have plead pleaded?
V-ing perfect
couldn't I have been plead pleading? couldn't you have been plead pleading? couldn't he have been plead pleading? couldn't we have been plead pleading? couldn't you have been plead pleading? couldn't they have been plead pleading?