English verb conjugation
CAN AGREE

Regular verb: agree - agreed - agreed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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