could model
Regular verb: model - modelled- modelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could model
you could model
she could model
we could model
you could model
they could model 	I could be modelling
you could be modelling
she could be modelling
we could be modelling
you could be modelling
they could be modelling	I could have modelled
you could have modelled
she could have modelled
we could have modelled
you could have modelled
they could have modelled	I could have been modelling
you could have been modelling
she could have been modelling
we could have been modelling
you could have been modelling
they could have been modelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not model
you could not model
she could not model
we could not model
you could not model
they could not model 	I could not be modelling
you could not be modelling
she could not be modelling
we could not be modelling
you could not be modelling
they could not be modelling	I could not have modelled
you could not have modelled
she could not have modelled
we could not have modelled
you could not have modelled
they could not have modelled	I could not have been modelling
you could not have been modelling
she could not have been modelling
we could not have been modelling
you could not have been modelling
they could not have been modelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I model?
could you model?
could she model?
could we model?
could you model?
could they model? 	could I be modelling?
could you be modelling?
could she be modelling?
could we be modelling?
could you be modelling?
could they be modelling? 	could I have modelled?
could you have modelled?
could she have modelled?
could we have modelled?
could you have modelled?
could they have modelled? 	could I have been modelling?
could you have been modelling?
could she have been modelling?
could we have been modelling?
could you have been modelling?
could they have been modelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not model?
could you not model?
could she not model?
could we not model?
could you not model?
could they not model? 	could I not be modelling?
could you not be modelling?
could she not be modelling?
could we not be modelling?
could you not be modelling?
could they not be modelling? 	could I not have modelled?
could you not have modelled?
could she not have modelled?
could we not have modelled?
could you not have modelled?
could they not have modelled? 	could I not have been modelling?
could you not have been modelling?
could she not have been modelling?
could we not have been modelling?
could you not have been modelling?
could they not have been modelling?