English verb conjugation
COULD SUPPOSE

Regular verb: suppose - supposed - supposed

Affirmation

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