could frighten
Regular verb: frighten - frightened- frightened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could frighten
you could frighten
she could frighten
we could frighten
you could frighten
they could frighten 	I could be frightening
you could be frightening
she could be frightening
we could be frightening
you could be frightening
they could be frightening	I could have frightened
you could have frightened
she could have frightened
we could have frightened
you could have frightened
they could have frightened	I could have been frightening
you could have been frightening
she could have been frightening
we could have been frightening
you could have been frightening
they could have been frightening	

Negation 	
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I couldn't frighten
you couldn't frighten
she couldn't frighten
we couldn't frighten
you couldn't frighten
they couldn't frighten 	I couldn't be frightening
you couldn't be frightening
she couldn't be frightening
we couldn't be frightening
you couldn't be frightening
they couldn't be frightening	I couldn't have frightened
you couldn't have frightened
she couldn't have frightened
we couldn't have frightened
you couldn't have frightened
they couldn't have frightened	I couldn't have been frightening
you couldn't have been frightening
she couldn't have been frightening
we couldn't have been frightening
you couldn't have been frightening
they couldn't have been frightening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I frighten?
could you frighten?
could she frighten?
could we frighten?
could you frighten?
could they frighten? 	could I be frightening?
could you be frightening?
could she be frightening?
could we be frightening?
could you be frightening?
could they be frightening? 	could I have frightened?
could you have frightened?
could she have frightened?
could we have frightened?
could you have frightened?
could they have frightened? 	could I have been frightening?
could you have been frightening?
could she have been frightening?
could we have been frightening?
could you have been frightening?
could they have been frightening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I frighten?
couldn't you frighten?
couldn't she frighten?
couldn't we frighten?
couldn't you frighten?
couldn't they frighten? 	couldn't I be frightening?
couldn't you be frightening?
couldn't she be frightening?
couldn't we be frightening?
couldn't you be frightening?
couldn't they be frightening? 	couldn't I have frightened?
couldn't you have frightened?
couldn't she have frightened?
couldn't we have frightened?
couldn't you have frightened?
couldn't they have frightened? 	couldn't I have been frightening?
couldn't you have been frightening?
couldn't she have been frightening?
couldn't we have been frightening?
couldn't you have been frightening?
couldn't they have been frightening?