English verb conjugation
COULD FRIGHTEN

Regular verb: frighten - frightened - frightened

Affirmation

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

Negation

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