English verb conjugation
MUST CURTAIL

Regular verb: curtail - curtailed - curtailed

Affirmation

Simple form	V-ing form
I must curtail you must curtail she must curtail we must curtail you must curtail they must curtail	I must be curtailing you must be curtailing she 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 she 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 she 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 mustn't curtail you mustn't curtail she mustn't curtail we mustn't curtail you mustn't curtail they mustn't curtail	I mustn't be curtailing you mustn't be curtailing she mustn't be curtailing we mustn't be curtailing you mustn't be curtailing they mustn't be curtailing
Perfect	V-ing perfect
I mustn't have curtailed you mustn't have curtailed she mustn't have curtailed we mustn't have curtailed you mustn't have curtailed they mustn't have curtailed	I mustn't have been curtailing you mustn't have been curtailing she mustn't have been curtailing we mustn't have been curtailing you mustn't have been curtailing they mustn't have been curtailing

Interrogative form

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