must curtail
Regular verb: curtail - curtailed- curtailed

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