English verb conjugation
MUST UNFASTEN

Regular verb: unfasten - unfastened - unfastened

Affirmation

Simple form	V-ing form
I must unfasten you must unfasten he must unfasten we must unfasten you must unfasten they must unfasten	I must be unfastening you must be unfastening he 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 he 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 he 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 must not unfasten you must not unfasten he must not unfasten we must not unfasten you must not unfasten they must not unfasten	I must not be unfastening you must not be unfastening he must not be unfastening we must not be unfastening you must not be unfastening they must not be unfastening
Perfect	V-ing perfect
I must not have unfastened you must not have unfastened he must not have unfastened we must not have unfastened you must not have unfastened they must not have unfastened	I must not have been unfastening you must not have been unfastening he must not have been unfastening we must not have been unfastening you must not have been unfastening they must not have been unfastening

Interrogative form

Simple form	V-ing form
must I unfasten? must you unfasten? must he unfasten? must we unfasten? must you unfasten? must they unfasten?	must I be unfastening? must you be unfastening? must he 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 he 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 he 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
must I not unfasten? must you not unfasten? must he not unfasten? must we not unfasten? must you not unfasten? must they not unfasten?	must I not be unfastening? must you not be unfastening? must he not be unfastening? must we not be unfastening? must you not be unfastening? must they not be unfastening?
Perfect	V-ing perfect
must I not have unfastened? must you not have unfastened? must he not have unfastened? must we not have unfastened? must you not have unfastened? must they not have unfastened?	must I not have been unfastening? must you not have been unfastening? must he not have been unfastening? must we not have been unfastening? must you not have been unfastening? must they not have been unfastening?