could fill
Regular verb: fill - filled- filled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could fill
you could fill
she could fill
we could fill
you could fill
they could fill 	I could be filling
you could be filling
she could be filling
we could be filling
you could be filling
they could be filling	I could have filled
you could have filled
she could have filled
we could have filled
you could have filled
they could have filled	I could have been filling
you could have been filling
she could have been filling
we could have been filling
you could have been filling
they could have been filling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not fill
you could not fill
she could not fill
we could not fill
you could not fill
they could not fill 	I could not be filling
you could not be filling
she could not be filling
we could not be filling
you could not be filling
they could not be filling	I could not have filled
you could not have filled
she could not have filled
we could not have filled
you could not have filled
they could not have filled	I could not have been filling
you could not have been filling
she could not have been filling
we could not have been filling
you could not have been filling
they could not have been filling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I fill?
could you fill?
could she fill?
could we fill?
could you fill?
could they fill? 	could I be filling?
could you be filling?
could she be filling?
could we be filling?
could you be filling?
could they be filling? 	could I have filled?
could you have filled?
could she have filled?
could we have filled?
could you have filled?
could they have filled? 	could I have been filling?
could you have been filling?
could she have been filling?
could we have been filling?
could you have been filling?
could they have been filling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not fill?
could you not fill?
could she not fill?
could we not fill?
could you not fill?
could they not fill? 	could I not be filling?
could you not be filling?
could she not be filling?
could we not be filling?
could you not be filling?
could they not be filling? 	could I not have filled?
could you not have filled?
could she not have filled?
could we not have filled?
could you not have filled?
could they not have filled? 	could I not have been filling?
could you not have been filling?
could she not have been filling?
could we not have been filling?
could you not have been filling?
could they not have been filling?