English verb conjugation
MUST CURTAIL

Regular verb: curtail - curtailed - curtailed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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