can suppose
Regular verb: suppose - supposed- supposed

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

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

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

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