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