could iterate
Regular verb: iterate - iterated- iterated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could iterate
you could iterate
she could iterate
we could iterate
you could iterate
they could iterate 	I could be iterating
you could be iterating
she could be iterating
we could be iterating
you could be iterating
they could be iterating	I could have iterated
you could have iterated
she could have iterated
we could have iterated
you could have iterated
they could have iterated	I could have been iterating
you could have been iterating
she could have been iterating
we could have been iterating
you could have been iterating
they could have been iterating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not iterate
you could not iterate
she could not iterate
we could not iterate
you could not iterate
they could not iterate 	I could not be iterating
you could not be iterating
she could not be iterating
we could not be iterating
you could not be iterating
they could not be iterating	I could not have iterated
you could not have iterated
she could not have iterated
we could not have iterated
you could not have iterated
they could not have iterated	I could not have been iterating
you could not have been iterating
she could not have been iterating
we could not have been iterating
you could not have been iterating
they could not have been iterating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I iterate?
could you iterate?
could she iterate?
could we iterate?
could you iterate?
could they iterate? 	could I be iterating?
could you be iterating?
could she be iterating?
could we be iterating?
could you be iterating?
could they be iterating? 	could I have iterated?
could you have iterated?
could she have iterated?
could we have iterated?
could you have iterated?
could they have iterated? 	could I have been iterating?
could you have been iterating?
could she have been iterating?
could we have been iterating?
could you have been iterating?
could they have been iterating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not iterate?
could you not iterate?
could she not iterate?
could we not iterate?
could you not iterate?
could they not iterate? 	could I not be iterating?
could you not be iterating?
could she not be iterating?
could we not be iterating?
could you not be iterating?
could they not be iterating? 	could I not have iterated?
could you not have iterated?
could she not have iterated?
could we not have iterated?
could you not have iterated?
could they not have iterated? 	could I not have been iterating?
could you not have been iterating?
could she not have been iterating?
could we not have been iterating?
could you not have been iterating?
could they not have been iterating?