must estivate
Regular verb: estivate - estivated- estivated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must estivate
you must estivate
he must estivate
we must estivate
you must estivate
they must estivate 	I must be estivating
you must be estivating
he must be estivating
we must be estivating
you must be estivating
they must be estivating	I must have estivated
you must have estivated
he must have estivated
we must have estivated
you must have estivated
they must have estivated	I must have been estivating
you must have been estivating
he must have been estivating
we must have been estivating
you must have been estivating
they must have been estivating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't estivate
you mustn't estivate
he mustn't estivate
we mustn't estivate
you mustn't estivate
they mustn't estivate 	I mustn't be estivating
you mustn't be estivating
he mustn't be estivating
we mustn't be estivating
you mustn't be estivating
they mustn't be estivating	I mustn't have estivated
you mustn't have estivated
he mustn't have estivated
we mustn't have estivated
you mustn't have estivated
they mustn't have estivated	I mustn't have been estivating
you mustn't have been estivating
he mustn't have been estivating
we mustn't have been estivating
you mustn't have been estivating
they mustn't have been estivating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I estivate?
must you estivate?
must he estivate?
must we estivate?
must you estivate?
must they estivate? 	must I be estivating?
must you be estivating?
must he be estivating?
must we be estivating?
must you be estivating?
must they be estivating? 	must I have estivated?
must you have estivated?
must he have estivated?
must we have estivated?
must you have estivated?
must they have estivated? 	must I have been estivating?
must you have been estivating?
must he have been estivating?
must we have been estivating?
must you have been estivating?
must they have been estivating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I estivate?
mustn't you estivate?
mustn't he estivate?
mustn't we estivate?
mustn't you estivate?
mustn't they estivate? 	mustn't I be estivating?
mustn't you be estivating?
mustn't he be estivating?
mustn't we be estivating?
mustn't you be estivating?
mustn't they be estivating? 	mustn't I have estivated?
mustn't you have estivated?
mustn't he have estivated?
mustn't we have estivated?
mustn't you have estivated?
mustn't they have estivated? 	mustn't I have been estivating?
mustn't you have been estivating?
mustn't he have been estivating?
mustn't we have been estivating?
mustn't you have been estivating?
mustn't they have been estivating?