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