could inform
Regular verb: inform - informed- informed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could inform
you could inform
she could inform
we could inform
you could inform
they could inform 	I could be informing
you could be informing
she could be informing
we could be informing
you could be informing
they could be informing	I could have informed
you could have informed
she could have informed
we could have informed
you could have informed
they could have informed	I could have been informing
you could have been informing
she could have been informing
we could have been informing
you could have been informing
they could have been informing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not inform
you could not inform
she could not inform
we could not inform
you could not inform
they could not inform 	I could not be informing
you could not be informing
she could not be informing
we could not be informing
you could not be informing
they could not be informing	I could not have informed
you could not have informed
she could not have informed
we could not have informed
you could not have informed
they could not have informed	I could not have been informing
you could not have been informing
she could not have been informing
we could not have been informing
you could not have been informing
they could not have been informing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I inform?
could you inform?
could she inform?
could we inform?
could you inform?
could they inform? 	could I be informing?
could you be informing?
could she be informing?
could we be informing?
could you be informing?
could they be informing? 	could I have informed?
could you have informed?
could she have informed?
could we have informed?
could you have informed?
could they have informed? 	could I have been informing?
could you have been informing?
could she have been informing?
could we have been informing?
could you have been informing?
could they have been informing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not inform?
could you not inform?
could she not inform?
could we not inform?
could you not inform?
could they not inform? 	could I not be informing?
could you not be informing?
could she not be informing?
could we not be informing?
could you not be informing?
could they not be informing? 	could I not have informed?
could you not have informed?
could she not have informed?
could we not have informed?
could you not have informed?
could they not have informed? 	could I not have been informing?
could you not have been informing?
could she not have been informing?
could we not have been informing?
could you not have been informing?
could they not have been informing?