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
she must frighten
we must frighten
you must frighten
they must frighten 	I must be frightening
you must be frightening
she must be frightening
we must be frightening
you must be frightening
they must be frightening	I must have frightened
you must have frightened
she 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
she 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
she 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
she 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
she 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
she 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 she frighten?
must we frighten?
must you frighten?
must they frighten? 	must I be frightening?
must you be frightening?
must she be frightening?
must we be frightening?
must you be frightening?
must they be frightening? 	must I have frightened?
must you have frightened?
must she 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 she 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 she 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 she 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 she 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 she have been frightening?
mustn't we have been frightening?
mustn't you have been frightening?
mustn't they have been frightening?