Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could assign assign you could assign assign he could assign assign we could assign assign you could assign assign they could assign assign
V-ing form
I could be assign assigning you could be assign assigning he could be assign assigning we could be assign assigning you could be assign assigning they could be assign assigning
Perfect
I could have assign assigned you could have assign assigned he could have assign assigned we could have assign assigned you could have assign assigned they could have assign assigned
V-ing perfect
I could have been assign assigning you could have been assign assigning he could have been assign assigning we could have been assign assigning you could have been assign assigning they could have been assign assigning
Negation
Simple form
I could not assign assign you could not assign assign he could not assign assign we could not assign assign you could not assign assign they could not assign assign
V-ing form
I could not be assign assigning you could not be assign assigning he could not be assign assigning we could not be assign assigning you could not be assign assigning they could not be assign assigning
Perfect
I could not have assign assigned you could not have assign assigned he could not have assign assigned we could not have assign assigned you could not have assign assigned they could not have assign assigned
V-ing perfect
I could not have been assign assigning you could not have been assign assigning he could not have been assign assigning we could not have been assign assigning you could not have been assign assigning they could not have been assign assigning
Interrogative form
Simple form
could I assign assign? could you assign assign? could he assign assign? could we assign assign? could you assign assign? could they assign assign?
V-ing form
could I be assign assigning? could you be assign assigning? could he be assign assigning? could we be assign assigning? could you be assign assigning? could they be assign assigning?
Perfect
could I have assign assigned? could you have assign assigned? could he have assign assigned? could we have assign assigned? could you have assign assigned? could they have assign assigned?
V-ing perfect
could I have been assign assigning? could you have been assign assigning? could he have been assign assigning? could we have been assign assigning? could you have been assign assigning? could they have been assign assigning?
Interro-negative form
Simple form
could I not assign assign? could you not assign assign? could he not assign assign? could we not assign assign? could you not assign assign? could they not assign assign?
V-ing form
could I not be assign assigning? could you not be assign assigning? could he not be assign assigning? could we not be assign assigning? could you not be assign assigning? could they not be assign assigning?
Perfect
could I not have assign assigned? could you not have assign assigned? could he not have assign assigned? could we not have assign assigned? could you not have assign assigned? could they not have assign assigned?
V-ing perfect
could I not have been assign assigning? could you not have been assign assigning? could he not have been assign assigning? could we not have been assign assigning? could you not have been assign assigning? could they not have been assign assigning?