English verb conjugation
CAN CURTAIL

Regular verb: curtail - curtailed - curtailed

Affirmation

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

Negation

Simple form	V-ing form
I can't curtail you can't curtail he can't curtail we can't curtail you can't curtail they can't curtail	I can't be curtailing you can't be curtailing he can't be curtailing we can't be curtailing you can't be curtailing they can't be curtailing
Perfect	V-ing perfect
I can't have curtailed you can't have curtailed he can't have curtailed we can't have curtailed you can't have curtailed they can't have curtailed	I can't have been curtailing you can't have been curtailing he can't have been curtailing we can't have been curtailing you can't have been curtailing they can't have been curtailing

Interrogative form

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

Interro-negative form

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