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 must not frighten
you must not frighten
she must not frighten
we must not frighten
you must not frighten
they must not frighten 	I must not be frightening
you must not be frightening
she must not be frightening
we must not be frightening
you must not be frightening
they must not be frightening	I must not have frightened
you must not have frightened
she must not have frightened
we must not have frightened
you must not have frightened
they must not have frightened	I must not have been frightening
you must not have been frightening
she must not have been frightening
we must not have been frightening
you must not have been frightening
they must not 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 	
must I not frighten?
must you not frighten?
must she not frighten?
must we not frighten?
must you not frighten?
must they not frighten? 	must I not be frightening?
must you not be frightening?
must she not be frightening?
must we not be frightening?
must you not be frightening?
must they not be frightening? 	must I not have frightened?
must you not have frightened?
must she not have frightened?
must we not have frightened?
must you not have frightened?
must they not have frightened? 	must I not have been frightening?
must you not have been frightening?
must she not have been frightening?
must we not have been frightening?
must you not have been frightening?
must they not have been frightening?