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