English verb conjugation
COULD REFILTER

Regular verb: refilter - refiltered - refiltered

Affirmation

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