could stagger
Regular verb: stagger - staggered- staggered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could stagger
you could stagger
she could stagger
we could stagger
you could stagger
they could stagger 	I could be staggering
you could be staggering
she could be staggering
we could be staggering
you could be staggering
they could be staggering	I could have staggered
you could have staggered
she could have staggered
we could have staggered
you could have staggered
they could have staggered	I could have been staggering
you could have been staggering
she could have been staggering
we could have been staggering
you could have been staggering
they could have been staggering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not stagger
you could not stagger
she could not stagger
we could not stagger
you could not stagger
they could not stagger 	I could not be staggering
you could not be staggering
she could not be staggering
we could not be staggering
you could not be staggering
they could not be staggering	I could not have staggered
you could not have staggered
she could not have staggered
we could not have staggered
you could not have staggered
they could not have staggered	I could not have been staggering
you could not have been staggering
she could not have been staggering
we could not have been staggering
you could not have been staggering
they could not have been staggering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I stagger?
could you stagger?
could she stagger?
could we stagger?
could you stagger?
could they stagger? 	could I be staggering?
could you be staggering?
could she be staggering?
could we be staggering?
could you be staggering?
could they be staggering? 	could I have staggered?
could you have staggered?
could she have staggered?
could we have staggered?
could you have staggered?
could they have staggered? 	could I have been staggering?
could you have been staggering?
could she have been staggering?
could we have been staggering?
could you have been staggering?
could they have been staggering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not stagger?
could you not stagger?
could she not stagger?
could we not stagger?
could you not stagger?
could they not stagger? 	could I not be staggering?
could you not be staggering?
could she not be staggering?
could we not be staggering?
could you not be staggering?
could they not be staggering? 	could I not have staggered?
could you not have staggered?
could she not have staggered?
could we not have staggered?
could you not have staggered?
could they not have staggered? 	could I not have been staggering?
could you not have been staggering?
could she not have been staggering?
could we not have been staggering?
could you not have been staggering?
could they not have been staggering?