English verb conjugation
MUST FRIGHTEN

Regular verb: frighten - frightened - frightened

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?