English verb conjugation
COULD CURTAIL

Regular verb: curtail - curtailed - curtailed

Affirmation

Simple form	V-ing form
I could curtail you could curtail he could curtail we could curtail you could curtail they could curtail	I could be curtailing you could be curtailing he could be curtailing we could be curtailing you could be curtailing they could be curtailing
Perfect	V-ing perfect
I could have curtailed you could have curtailed he could have curtailed we could have curtailed you could have curtailed they could have curtailed	I could have been curtailing you could have been curtailing he could have been curtailing we could have been curtailing you could have been curtailing they could have been curtailing

Negation

Simple form	V-ing form
I could not curtail you could not curtail he could not curtail we could not curtail you could not curtail they could not curtail	I could not be curtailing you could not be curtailing he could not be curtailing we could not be curtailing you could not be curtailing they could not be curtailing
Perfect	V-ing perfect
I could not have curtailed you could not have curtailed he could not have curtailed we could not have curtailed you could not have curtailed they could not have curtailed	I could not have been curtailing you could not have been curtailing he could not have been curtailing we could not have been curtailing you could not have been curtailing they could not have been curtailing

Interrogative form

Simple form	V-ing form
could I curtail? could you curtail? could he curtail? could we curtail? could you curtail? could they curtail?	could I be curtailing? could you be curtailing? could he be curtailing? could we be curtailing? could you be curtailing? could they be curtailing?
Perfect	V-ing perfect
could I have curtailed? could you have curtailed? could he have curtailed? could we have curtailed? could you have curtailed? could they have curtailed?	could I have been curtailing? could you have been curtailing? could he have been curtailing? could we have been curtailing? could you have been curtailing? could they have been curtailing?

Interro-negative form

Simple form	V-ing form
could I not curtail? could you not curtail? could he not curtail? could we not curtail? could you not curtail? could they not curtail?	could I not be curtailing? could you not be curtailing? could he not be curtailing? could we not be curtailing? could you not be curtailing? could they not be curtailing?
Perfect	V-ing perfect
could I not have curtailed? could you not have curtailed? could he not have curtailed? could we not have curtailed? could you not have curtailed? could they not have curtailed?	could I not have been curtailing? could you not have been curtailing? could he not have been curtailing? could we not have been curtailing? could you not have been curtailing? could they not have been curtailing?