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 couldn't curtail you couldn't curtail he couldn't curtail we couldn't curtail you couldn't curtail they couldn't curtail	I couldn't be curtailing you couldn't be curtailing he couldn't be curtailing we couldn't be curtailing you couldn't be curtailing they couldn't be curtailing
Perfect	V-ing perfect
I couldn't have curtailed you couldn't have curtailed he couldn't have curtailed we couldn't have curtailed you couldn't have curtailed they couldn't have curtailed	I couldn't have been curtailing you couldn't have been curtailing he couldn't have been curtailing we couldn't have been curtailing you couldn't have been curtailing they couldn't 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
couldn't I curtail? couldn't you curtail? couldn't he curtail? couldn't we curtail? couldn't you curtail? couldn't they curtail?	couldn't I be curtailing? couldn't you be curtailing? couldn't he be curtailing? couldn't we be curtailing? couldn't you be curtailing? couldn't they be curtailing?
Perfect	V-ing perfect
couldn't I have curtailed? couldn't you have curtailed? couldn't he have curtailed? couldn't we have curtailed? couldn't you have curtailed? couldn't they have curtailed?	couldn't I have been curtailing? couldn't you have been curtailing? couldn't he have been curtailing? couldn't we have been curtailing? couldn't you have been curtailing? couldn't they have been curtailing?