English verb conjugation
MUST LEATHER

Regular verb: leather - leathered - leathered

Affirmation

Simple form	V-ing form
I must leather you must leather she must leather we must leather you must leather they must leather	I must be leathering you must be leathering she must be leathering we must be leathering you must be leathering they must be leathering
Perfect	V-ing perfect
I must have leathered you must have leathered she must have leathered we must have leathered you must have leathered they must have leathered	I must have been leathering you must have been leathering she must have been leathering we must have been leathering you must have been leathering they must have been leathering

Negation

Simple form	V-ing form
I mustn't leather you mustn't leather she mustn't leather we mustn't leather you mustn't leather they mustn't leather	I mustn't be leathering you mustn't be leathering she mustn't be leathering we mustn't be leathering you mustn't be leathering they mustn't be leathering
Perfect	V-ing perfect
I mustn't have leathered you mustn't have leathered she mustn't have leathered we mustn't have leathered you mustn't have leathered they mustn't have leathered	I mustn't have been leathering you mustn't have been leathering she mustn't have been leathering we mustn't have been leathering you mustn't have been leathering they mustn't have been leathering

Interrogative form

Simple form	V-ing form
must I leather? must you leather? must she leather? must we leather? must you leather? must they leather?	must I be leathering? must you be leathering? must she be leathering? must we be leathering? must you be leathering? must they be leathering?
Perfect	V-ing perfect
must I have leathered? must you have leathered? must she have leathered? must we have leathered? must you have leathered? must they have leathered?	must I have been leathering? must you have been leathering? must she have been leathering? must we have been leathering? must you have been leathering? must they have been leathering?

Interro-negative form

Simple form	V-ing form
mustn't I leather? mustn't you leather? mustn't she leather? mustn't we leather? mustn't you leather? mustn't they leather?	mustn't I be leathering? mustn't you be leathering? mustn't she be leathering? mustn't we be leathering? mustn't you be leathering? mustn't they be leathering?
Perfect	V-ing perfect
mustn't I have leathered? mustn't you have leathered? mustn't she have leathered? mustn't we have leathered? mustn't you have leathered? mustn't they have leathered?	mustn't I have been leathering? mustn't you have been leathering? mustn't she have been leathering? mustn't we have been leathering? mustn't you have been leathering? mustn't they have been leathering?