English verb conjugation
COULD AGREE

Regular verb: agree - agreed - agreed

Affirmation

Simple form	V-ing form
I could agree you could agree he could agree we could agree you could agree they could agree	I could be agreeing you could be agreeing he could be agreeing we could be agreeing you could be agreeing they could be agreeing
Perfect	V-ing perfect
I could have agreed you could have agreed he could have agreed we could have agreed you could have agreed they could have agreed	I could have been agreeing you could have been agreeing he could have been agreeing we could have been agreeing you could have been agreeing they could have been agreeing

Negation

Simple form	V-ing form
I couldn't agree you couldn't agree he couldn't agree we couldn't agree you couldn't agree they couldn't agree	I couldn't be agreeing you couldn't be agreeing he couldn't be agreeing we couldn't be agreeing you couldn't be agreeing they couldn't be agreeing
Perfect	V-ing perfect
I couldn't have agreed you couldn't have agreed he couldn't have agreed we couldn't have agreed you couldn't have agreed they couldn't have agreed	I couldn't have been agreeing you couldn't have been agreeing he couldn't have been agreeing we couldn't have been agreeing you couldn't have been agreeing they couldn't have been agreeing

Interrogative form

Simple form	V-ing form
could I agree? could you agree? could he agree? could we agree? could you agree? could they agree?	could I be agreeing? could you be agreeing? could he be agreeing? could we be agreeing? could you be agreeing? could they be agreeing?
Perfect	V-ing perfect
could I have agreed? could you have agreed? could he have agreed? could we have agreed? could you have agreed? could they have agreed?	could I have been agreeing? could you have been agreeing? could he have been agreeing? could we have been agreeing? could you have been agreeing? could they have been agreeing?

Interro-negative form

Simple form	V-ing form
couldn't I agree? couldn't you agree? couldn't he agree? couldn't we agree? couldn't you agree? couldn't they agree?	couldn't I be agreeing? couldn't you be agreeing? couldn't he be agreeing? couldn't we be agreeing? couldn't you be agreeing? couldn't they be agreeing?
Perfect	V-ing perfect
couldn't I have agreed? couldn't you have agreed? couldn't he have agreed? couldn't we have agreed? couldn't you have agreed? couldn't they have agreed?	couldn't I have been agreeing? couldn't you have been agreeing? couldn't he have been agreeing? couldn't we have been agreeing? couldn't you have been agreeing? couldn't they have been agreeing?