English verb conjugation
MUST ROUGHEN

Regular verb: roughen - roughened - roughened

Affirmation

Simple form	V-ing form
I must roughen you must roughen he must roughen we must roughen you must roughen they must roughen	I must be roughening you must be roughening he must be roughening we must be roughening you must be roughening they must be roughening
Perfect	V-ing perfect
I must have roughened you must have roughened he must have roughened we must have roughened you must have roughened they must have roughened	I must have been roughening you must have been roughening he must have been roughening we must have been roughening you must have been roughening they must have been roughening

Negation

Simple form	V-ing form
I mustn't roughen you mustn't roughen he mustn't roughen we mustn't roughen you mustn't roughen they mustn't roughen	I mustn't be roughening you mustn't be roughening he mustn't be roughening we mustn't be roughening you mustn't be roughening they mustn't be roughening
Perfect	V-ing perfect
I mustn't have roughened you mustn't have roughened he mustn't have roughened we mustn't have roughened you mustn't have roughened they mustn't have roughened	I mustn't have been roughening you mustn't have been roughening he mustn't have been roughening we mustn't have been roughening you mustn't have been roughening they mustn't have been roughening

Interrogative form

Simple form	V-ing form
must I roughen? must you roughen? must he roughen? must we roughen? must you roughen? must they roughen?	must I be roughening? must you be roughening? must he be roughening? must we be roughening? must you be roughening? must they be roughening?
Perfect	V-ing perfect
must I have roughened? must you have roughened? must he have roughened? must we have roughened? must you have roughened? must they have roughened?	must I have been roughening? must you have been roughening? must he have been roughening? must we have been roughening? must you have been roughening? must they have been roughening?

Interro-negative form

Simple form	V-ing form
mustn't I roughen? mustn't you roughen? mustn't he roughen? mustn't we roughen? mustn't you roughen? mustn't they roughen?	mustn't I be roughening? mustn't you be roughening? mustn't he be roughening? mustn't we be roughening? mustn't you be roughening? mustn't they be roughening?
Perfect	V-ing perfect
mustn't I have roughened? mustn't you have roughened? mustn't he have roughened? mustn't we have roughened? mustn't you have roughened? mustn't they have roughened?	mustn't I have been roughening? mustn't you have been roughening? mustn't he have been roughening? mustn't we have been roughening? mustn't you have been roughening? mustn't they have been roughening?