English verb conjugation
MUST UNFASTEN

Regular verb: unfasten - unfastened - unfastened

Affirmation

Simple form	V-ing form
I must unfasten you must unfasten she must unfasten we must unfasten you must unfasten they must unfasten	I must be unfastening you must be unfastening she must be unfastening we must be unfastening you must be unfastening they must be unfastening
Perfect	V-ing perfect
I must have unfastened you must have unfastened she must have unfastened we must have unfastened you must have unfastened they must have unfastened	I must have been unfastening you must have been unfastening she must have been unfastening we must have been unfastening you must have been unfastening they must have been unfastening

Negation

Simple form	V-ing form
I mustn't unfasten you mustn't unfasten she mustn't unfasten we mustn't unfasten you mustn't unfasten they mustn't unfasten	I mustn't be unfastening you mustn't be unfastening she mustn't be unfastening we mustn't be unfastening you mustn't be unfastening they mustn't be unfastening
Perfect	V-ing perfect
I mustn't have unfastened you mustn't have unfastened she mustn't have unfastened we mustn't have unfastened you mustn't have unfastened they mustn't have unfastened	I mustn't have been unfastening you mustn't have been unfastening she mustn't have been unfastening we mustn't have been unfastening you mustn't have been unfastening they mustn't have been unfastening

Interrogative form

Simple form	V-ing form
must I unfasten? must you unfasten? must she unfasten? must we unfasten? must you unfasten? must they unfasten?	must I be unfastening? must you be unfastening? must she be unfastening? must we be unfastening? must you be unfastening? must they be unfastening?
Perfect	V-ing perfect
must I have unfastened? must you have unfastened? must she have unfastened? must we have unfastened? must you have unfastened? must they have unfastened?	must I have been unfastening? must you have been unfastening? must she have been unfastening? must we have been unfastening? must you have been unfastening? must they have been unfastening?

Interro-negative form

Simple form	V-ing form
mustn't I unfasten? mustn't you unfasten? mustn't she unfasten? mustn't we unfasten? mustn't you unfasten? mustn't they unfasten?	mustn't I be unfastening? mustn't you be unfastening? mustn't she be unfastening? mustn't we be unfastening? mustn't you be unfastening? mustn't they be unfastening?
Perfect	V-ing perfect
mustn't I have unfastened? mustn't you have unfastened? mustn't she have unfastened? mustn't we have unfastened? mustn't you have unfastened? mustn't they have unfastened?	mustn't I have been unfastening? mustn't you have been unfastening? mustn't she have been unfastening? mustn't we have been unfastening? mustn't you have been unfastening? mustn't they have been unfastening?