could graduate
Regular verb: graduate - graduated- graduated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could graduate
you could graduate
she could graduate
we could graduate
you could graduate
they could graduate 	I could be graduating
you could be graduating
she could be graduating
we could be graduating
you could be graduating
they could be graduating	I could have graduated
you could have graduated
she could have graduated
we could have graduated
you could have graduated
they could have graduated	I could have been graduating
you could have been graduating
she could have been graduating
we could have been graduating
you could have been graduating
they could have been graduating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't graduate
you couldn't graduate
she couldn't graduate
we couldn't graduate
you couldn't graduate
they couldn't graduate 	I couldn't be graduating
you couldn't be graduating
she couldn't be graduating
we couldn't be graduating
you couldn't be graduating
they couldn't be graduating	I couldn't have graduated
you couldn't have graduated
she couldn't have graduated
we couldn't have graduated
you couldn't have graduated
they couldn't have graduated	I couldn't have been graduating
you couldn't have been graduating
she couldn't have been graduating
we couldn't have been graduating
you couldn't have been graduating
they couldn't have been graduating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I graduate?
could you graduate?
could she graduate?
could we graduate?
could you graduate?
could they graduate? 	could I be graduating?
could you be graduating?
could she be graduating?
could we be graduating?
could you be graduating?
could they be graduating? 	could I have graduated?
could you have graduated?
could she have graduated?
could we have graduated?
could you have graduated?
could they have graduated? 	could I have been graduating?
could you have been graduating?
could she have been graduating?
could we have been graduating?
could you have been graduating?
could they have been graduating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I graduate?
couldn't you graduate?
couldn't she graduate?
couldn't we graduate?
couldn't you graduate?
couldn't they graduate? 	couldn't I be graduating?
couldn't you be graduating?
couldn't she be graduating?
couldn't we be graduating?
couldn't you be graduating?
couldn't they be graduating? 	couldn't I have graduated?
couldn't you have graduated?
couldn't she have graduated?
couldn't we have graduated?
couldn't you have graduated?
couldn't they have graduated? 	couldn't I have been graduating?
couldn't you have been graduating?
couldn't she have been graduating?
couldn't we have been graduating?
couldn't you have been graduating?
couldn't they have been graduating?