could suppose
Regular verb: suppose - supposed- supposed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could suppose
you could suppose
he could suppose
we could suppose
you could suppose
they could suppose 	I could be supposing
you could be supposing
he could be supposing
we could be supposing
you could be supposing
they could be supposing	I could have supposed
you could have supposed
he could have supposed
we could have supposed
you could have supposed
they could have supposed	I could have been supposing
you could have been supposing
he could have been supposing
we could have been supposing
you could have been supposing
they could have been supposing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't suppose
you couldn't suppose
he couldn't suppose
we couldn't suppose
you couldn't suppose
they couldn't suppose 	I couldn't be supposing
you couldn't be supposing
he couldn't be supposing
we couldn't be supposing
you couldn't be supposing
they couldn't be supposing	I couldn't have supposed
you couldn't have supposed
he couldn't have supposed
we couldn't have supposed
you couldn't have supposed
they couldn't have supposed	I couldn't have been supposing
you couldn't have been supposing
he couldn't have been supposing
we couldn't have been supposing
you couldn't have been supposing
they couldn't have been supposing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I suppose?
could you suppose?
could he suppose?
could we suppose?
could you suppose?
could they suppose? 	could I be supposing?
could you be supposing?
could he be supposing?
could we be supposing?
could you be supposing?
could they be supposing? 	could I have supposed?
could you have supposed?
could he have supposed?
could we have supposed?
could you have supposed?
could they have supposed? 	could I have been supposing?
could you have been supposing?
could he have been supposing?
could we have been supposing?
could you have been supposing?
could they have been supposing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I suppose?
couldn't you suppose?
couldn't he suppose?
couldn't we suppose?
couldn't you suppose?
couldn't they suppose? 	couldn't I be supposing?
couldn't you be supposing?
couldn't he be supposing?
couldn't we be supposing?
couldn't you be supposing?
couldn't they be supposing? 	couldn't I have supposed?
couldn't you have supposed?
couldn't he have supposed?
couldn't we have supposed?
couldn't you have supposed?
couldn't they have supposed? 	couldn't I have been supposing?
couldn't you have been supposing?
couldn't he have been supposing?
couldn't we have been supposing?
couldn't you have been supposing?
couldn't they have been supposing?