could linger
Regular verb: linger - lingered- lingered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could linger
you could linger
she could linger
we could linger
you could linger
they could linger 	I could be lingering
you could be lingering
she could be lingering
we could be lingering
you could be lingering
they could be lingering	I could have lingered
you could have lingered
she could have lingered
we could have lingered
you could have lingered
they could have lingered	I could have been lingering
you could have been lingering
she could have been lingering
we could have been lingering
you could have been lingering
they could have been lingering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't linger
you couldn't linger
she couldn't linger
we couldn't linger
you couldn't linger
they couldn't linger 	I couldn't be lingering
you couldn't be lingering
she couldn't be lingering
we couldn't be lingering
you couldn't be lingering
they couldn't be lingering	I couldn't have lingered
you couldn't have lingered
she couldn't have lingered
we couldn't have lingered
you couldn't have lingered
they couldn't have lingered	I couldn't have been lingering
you couldn't have been lingering
she couldn't have been lingering
we couldn't have been lingering
you couldn't have been lingering
they couldn't have been lingering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I linger?
could you linger?
could she linger?
could we linger?
could you linger?
could they linger? 	could I be lingering?
could you be lingering?
could she be lingering?
could we be lingering?
could you be lingering?
could they be lingering? 	could I have lingered?
could you have lingered?
could she have lingered?
could we have lingered?
could you have lingered?
could they have lingered? 	could I have been lingering?
could you have been lingering?
could she have been lingering?
could we have been lingering?
could you have been lingering?
could they have been lingering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I linger?
couldn't you linger?
couldn't she linger?
couldn't we linger?
couldn't you linger?
couldn't they linger? 	couldn't I be lingering?
couldn't you be lingering?
couldn't she be lingering?
couldn't we be lingering?
couldn't you be lingering?
couldn't they be lingering? 	couldn't I have lingered?
couldn't you have lingered?
couldn't she have lingered?
couldn't we have lingered?
couldn't you have lingered?
couldn't they have lingered? 	couldn't I have been lingering?
couldn't you have been lingering?
couldn't she have been lingering?
couldn't we have been lingering?
couldn't you have been lingering?
couldn't they have been lingering?