English verb conjugation
MUST UNSCREW

Regular verb: unscrew - unscrewed - unscrewed

Affirmation

Simple form	V-ing form
I must unscrew you must unscrew he must unscrew we must unscrew you must unscrew they must unscrew	I must be unscrewing you must be unscrewing he must be unscrewing we must be unscrewing you must be unscrewing they must be unscrewing
Perfect	V-ing perfect
I must have unscrewed you must have unscrewed he must have unscrewed we must have unscrewed you must have unscrewed they must have unscrewed	I must have been unscrewing you must have been unscrewing he must have been unscrewing we must have been unscrewing you must have been unscrewing they must have been unscrewing

Negation

Simple form	V-ing form
I mustn't unscrew you mustn't unscrew he mustn't unscrew we mustn't unscrew you mustn't unscrew they mustn't unscrew	I mustn't be unscrewing you mustn't be unscrewing he mustn't be unscrewing we mustn't be unscrewing you mustn't be unscrewing they mustn't be unscrewing
Perfect	V-ing perfect
I mustn't have unscrewed you mustn't have unscrewed he mustn't have unscrewed we mustn't have unscrewed you mustn't have unscrewed they mustn't have unscrewed	I mustn't have been unscrewing you mustn't have been unscrewing he mustn't have been unscrewing we mustn't have been unscrewing you mustn't have been unscrewing they mustn't have been unscrewing

Interrogative form

Simple form	V-ing form
must I unscrew? must you unscrew? must he unscrew? must we unscrew? must you unscrew? must they unscrew?	must I be unscrewing? must you be unscrewing? must he be unscrewing? must we be unscrewing? must you be unscrewing? must they be unscrewing?
Perfect	V-ing perfect
must I have unscrewed? must you have unscrewed? must he have unscrewed? must we have unscrewed? must you have unscrewed? must they have unscrewed?	must I have been unscrewing? must you have been unscrewing? must he have been unscrewing? must we have been unscrewing? must you have been unscrewing? must they have been unscrewing?

Interro-negative form

Simple form	V-ing form
mustn't I unscrew? mustn't you unscrew? mustn't he unscrew? mustn't we unscrew? mustn't you unscrew? mustn't they unscrew?	mustn't I be unscrewing? mustn't you be unscrewing? mustn't he be unscrewing? mustn't we be unscrewing? mustn't you be unscrewing? mustn't they be unscrewing?
Perfect	V-ing perfect
mustn't I have unscrewed? mustn't you have unscrewed? mustn't he have unscrewed? mustn't we have unscrewed? mustn't you have unscrewed? mustn't they have unscrewed?	mustn't I have been unscrewing? mustn't you have been unscrewing? mustn't he have been unscrewing? mustn't we have been unscrewing? mustn't you have been unscrewing? mustn't they have been unscrewing?