must frighten
Verbo regular: frighten - frightened- frightened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must frighten
you must frighten
he must frighten
we must frighten
you must frighten
they must frighten 	I must be frightening
you must be frightening
he must be frightening
we must be frightening
you must be frightening
they must be frightening	I must have frightened
you must have frightened
he must have frightened
we must have frightened
you must have frightened
they must have frightened	I must have been frightening
you must have been frightening
he must have been frightening
we must have been frightening
you must have been frightening
they must have been frightening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't frighten
you mustn't frighten
he mustn't frighten
we mustn't frighten
you mustn't frighten
they mustn't frighten 	I mustn't be frightening
you mustn't be frightening
he mustn't be frightening
we mustn't be frightening
you mustn't be frightening
they mustn't be frightening	I mustn't have frightened
you mustn't have frightened
he mustn't have frightened
we mustn't have frightened
you mustn't have frightened
they mustn't have frightened	I mustn't have been frightening
you mustn't have been frightening
he mustn't have been frightening
we mustn't have been frightening
you mustn't have been frightening
they mustn't have been frightening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I frighten?
must you frighten?
must he frighten?
must we frighten?
must you frighten?
must they frighten? 	must I be frightening?
must you be frightening?
must he be frightening?
must we be frightening?
must you be frightening?
must they be frightening? 	must I have frightened?
must you have frightened?
must he have frightened?
must we have frightened?
must you have frightened?
must they have frightened? 	must I have been frightening?
must you have been frightening?
must he have been frightening?
must we have been frightening?
must you have been frightening?
must they have been frightening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I frighten?
mustn't you frighten?
mustn't he frighten?
mustn't we frighten?
mustn't you frighten?
mustn't they frighten? 	mustn't I be frightening?
mustn't you be frightening?
mustn't he be frightening?
mustn't we be frightening?
mustn't you be frightening?
mustn't they be frightening? 	mustn't I have frightened?
mustn't you have frightened?
mustn't he have frightened?
mustn't we have frightened?
mustn't you have frightened?
mustn't they have frightened? 	mustn't I have been frightening?
mustn't you have been frightening?
mustn't he have been frightening?
mustn't we have been frightening?
mustn't you have been frightening?
mustn't they have been frightening?