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 cannot curtail you cannot curtail he cannot curtail we cannot curtail you cannot curtail they cannot curtail	I cannot be curtailing you cannot be curtailing he cannot be curtailing we cannot be curtailing you cannot be curtailing they cannot be curtailing
Perfect	V-ing perfect
I cannot have curtailed you cannot have curtailed he cannot have curtailed we cannot have curtailed you cannot have curtailed they cannot have curtailed	I cannot have been curtailing you cannot have been curtailing he cannot have been curtailing we cannot have been curtailing you cannot have been curtailing they cannot 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 I not curtail? can you not curtail? can he not curtail? can we not curtail? can you not curtail? can they not curtail?	can I not be curtailing? can you not be curtailing? can he not be curtailing? can we not be curtailing? can you not be curtailing? can they not be curtailing?
Perfect	V-ing perfect
can I not have curtailed? can you not have curtailed? can he not have curtailed? can we not have curtailed? can you not have curtailed? can they not have curtailed?	can I not have been curtailing? can you not have been curtailing? can he not have been curtailing? can we not have been curtailing? can you not have been curtailing? can they not have been curtailing?