could refilter
Regular verb: refilter - refiltered- refiltered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could refilter
you could refilter
she could refilter
we could refilter
you could refilter
they could refilter 	I could be refiltering
you could be refiltering
she could be refiltering
we could be refiltering
you could be refiltering
they could be refiltering	I could have refiltered
you could have refiltered
she could have refiltered
we could have refiltered
you could have refiltered
they could have refiltered	I could have been refiltering
you could have been refiltering
she could have been refiltering
we could have been refiltering
you could have been refiltering
they could have been refiltering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't refilter
you couldn't refilter
she couldn't refilter
we couldn't refilter
you couldn't refilter
they couldn't refilter 	I couldn't be refiltering
you couldn't be refiltering
she couldn't be refiltering
we couldn't be refiltering
you couldn't be refiltering
they couldn't be refiltering	I couldn't have refiltered
you couldn't have refiltered
she couldn't have refiltered
we couldn't have refiltered
you couldn't have refiltered
they couldn't have refiltered	I couldn't have been refiltering
you couldn't have been refiltering
she couldn't have been refiltering
we couldn't have been refiltering
you couldn't have been refiltering
they couldn't have been refiltering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I refilter?
could you refilter?
could she refilter?
could we refilter?
could you refilter?
could they refilter? 	could I be refiltering?
could you be refiltering?
could she be refiltering?
could we be refiltering?
could you be refiltering?
could they be refiltering? 	could I have refiltered?
could you have refiltered?
could she have refiltered?
could we have refiltered?
could you have refiltered?
could they have refiltered? 	could I have been refiltering?
could you have been refiltering?
could she have been refiltering?
could we have been refiltering?
could you have been refiltering?
could they have been refiltering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I refilter?
couldn't you refilter?
couldn't she refilter?
couldn't we refilter?
couldn't you refilter?
couldn't they refilter? 	couldn't I be refiltering?
couldn't you be refiltering?
couldn't she be refiltering?
couldn't we be refiltering?
couldn't you be refiltering?
couldn't they be refiltering? 	couldn't I have refiltered?
couldn't you have refiltered?
couldn't she have refiltered?
couldn't we have refiltered?
couldn't you have refiltered?
couldn't they have refiltered? 	couldn't I have been refiltering?
couldn't you have been refiltering?
couldn't she have been refiltering?
couldn't we have been refiltering?
couldn't you have been refiltering?
couldn't they have been refiltering?