English verb conjugation
COULD ULTRAFILTER

Regular verb: ultrafilter - ultrafiltered - ultrafiltered

Affirmation

Simple form	V-ing form
I could ultrafilter you could ultrafilter he could ultrafilter we could ultrafilter you could ultrafilter they could ultrafilter	I could be ultrafiltering you could be ultrafiltering he could be ultrafiltering we could be ultrafiltering you could be ultrafiltering they could be ultrafiltering
Perfect	V-ing perfect
I could have ultrafiltered you could have ultrafiltered he could have ultrafiltered we could have ultrafiltered you could have ultrafiltered they could have ultrafiltered	I could have been ultrafiltering you could have been ultrafiltering he could have been ultrafiltering we could have been ultrafiltering you could have been ultrafiltering they could have been ultrafiltering

Negation

Simple form	V-ing form
I couldn't ultrafilter you couldn't ultrafilter he couldn't ultrafilter we couldn't ultrafilter you couldn't ultrafilter they couldn't ultrafilter	I couldn't be ultrafiltering you couldn't be ultrafiltering he couldn't be ultrafiltering we couldn't be ultrafiltering you couldn't be ultrafiltering they couldn't be ultrafiltering
Perfect	V-ing perfect
I couldn't have ultrafiltered you couldn't have ultrafiltered he couldn't have ultrafiltered we couldn't have ultrafiltered you couldn't have ultrafiltered they couldn't have ultrafiltered	I couldn't have been ultrafiltering you couldn't have been ultrafiltering he couldn't have been ultrafiltering we couldn't have been ultrafiltering you couldn't have been ultrafiltering they couldn't have been ultrafiltering

Interrogative form

Simple form	V-ing form
could I ultrafilter? could you ultrafilter? could he ultrafilter? could we ultrafilter? could you ultrafilter? could they ultrafilter?	could I be ultrafiltering? could you be ultrafiltering? could he be ultrafiltering? could we be ultrafiltering? could you be ultrafiltering? could they be ultrafiltering?
Perfect	V-ing perfect
could I have ultrafiltered? could you have ultrafiltered? could he have ultrafiltered? could we have ultrafiltered? could you have ultrafiltered? could they have ultrafiltered?	could I have been ultrafiltering? could you have been ultrafiltering? could he have been ultrafiltering? could we have been ultrafiltering? could you have been ultrafiltering? could they have been ultrafiltering?

Interro-negative form

Simple form	V-ing form
couldn't I ultrafilter? couldn't you ultrafilter? couldn't he ultrafilter? couldn't we ultrafilter? couldn't you ultrafilter? couldn't they ultrafilter?	couldn't I be ultrafiltering? couldn't you be ultrafiltering? couldn't he be ultrafiltering? couldn't we be ultrafiltering? couldn't you be ultrafiltering? couldn't they be ultrafiltering?
Perfect	V-ing perfect
couldn't I have ultrafiltered? couldn't you have ultrafiltered? couldn't he have ultrafiltered? couldn't we have ultrafiltered? couldn't you have ultrafiltered? couldn't they have ultrafiltered?	couldn't I have been ultrafiltering? couldn't you have been ultrafiltering? couldn't he have been ultrafiltering? couldn't we have been ultrafiltering? couldn't you have been ultrafiltering? couldn't they have been ultrafiltering?