must ululate
Regular verb: ululate - ululated- ululated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must ululate
you must ululate
she must ululate
we must ululate
you must ululate
they must ululate 	I must be ululating
you must be ululating
she must be ululating
we must be ululating
you must be ululating
they must be ululating	I must have ululated
you must have ululated
she must have ululated
we must have ululated
you must have ululated
they must have ululated	I must have been ululating
you must have been ululating
she must have been ululating
we must have been ululating
you must have been ululating
they must have been ululating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't ululate
you mustn't ululate
she mustn't ululate
we mustn't ululate
you mustn't ululate
they mustn't ululate 	I mustn't be ululating
you mustn't be ululating
she mustn't be ululating
we mustn't be ululating
you mustn't be ululating
they mustn't be ululating	I mustn't have ululated
you mustn't have ululated
she mustn't have ululated
we mustn't have ululated
you mustn't have ululated
they mustn't have ululated	I mustn't have been ululating
you mustn't have been ululating
she mustn't have been ululating
we mustn't have been ululating
you mustn't have been ululating
they mustn't have been ululating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I ululate?
must you ululate?
must she ululate?
must we ululate?
must you ululate?
must they ululate? 	must I be ululating?
must you be ululating?
must she be ululating?
must we be ululating?
must you be ululating?
must they be ululating? 	must I have ululated?
must you have ululated?
must she have ululated?
must we have ululated?
must you have ululated?
must they have ululated? 	must I have been ululating?
must you have been ululating?
must she have been ululating?
must we have been ululating?
must you have been ululating?
must they have been ululating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I ululate?
mustn't you ululate?
mustn't she ululate?
mustn't we ululate?
mustn't you ululate?
mustn't they ululate? 	mustn't I be ululating?
mustn't you be ululating?
mustn't she be ululating?
mustn't we be ululating?
mustn't you be ululating?
mustn't they be ululating? 	mustn't I have ululated?
mustn't you have ululated?
mustn't she have ululated?
mustn't we have ululated?
mustn't you have ululated?
mustn't they have ululated? 	mustn't I have been ululating?
mustn't you have been ululating?
mustn't she have been ululating?
mustn't we have been ululating?
mustn't you have been ululating?
mustn't they have been ululating?