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 couldn't stagger
you couldn't stagger
she couldn't stagger
we couldn't stagger
you couldn't stagger
they couldn't stagger 	I couldn't be staggering
you couldn't be staggering
she couldn't be staggering
we couldn't be staggering
you couldn't be staggering
they couldn't be staggering	I couldn't have staggered
you couldn't have staggered
she couldn't have staggered
we couldn't have staggered
you couldn't have staggered
they couldn't have staggered	I couldn't have been staggering
you couldn't have been staggering
she couldn't have been staggering
we couldn't have been staggering
you couldn't have been staggering
they couldn't 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 	
couldn't I stagger?
couldn't you stagger?
couldn't she stagger?
couldn't we stagger?
couldn't you stagger?
couldn't they stagger? 	couldn't I be staggering?
couldn't you be staggering?
couldn't she be staggering?
couldn't we be staggering?
couldn't you be staggering?
couldn't they be staggering? 	couldn't I have staggered?
couldn't you have staggered?
couldn't she have staggered?
couldn't we have staggered?
couldn't you have staggered?
couldn't they have staggered? 	couldn't I have been staggering?
couldn't you have been staggering?
couldn't she have been staggering?
couldn't we have been staggering?
couldn't you have been staggering?
couldn't they have been staggering?