English verb conjugation
MUST PUCKER

Regular verb: pucker - puckered - puckered

Affirmation

Simple form	V-ing form
I must pucker you must pucker he must pucker we must pucker you must pucker they must pucker	I must be puckering you must be puckering he must be puckering we must be puckering you must be puckering they must be puckering
Perfect	V-ing perfect
I must have puckered you must have puckered he must have puckered we must have puckered you must have puckered they must have puckered	I must have been puckering you must have been puckering he must have been puckering we must have been puckering you must have been puckering they must have been puckering

Negation

Simple form	V-ing form
I must not pucker you must not pucker he must not pucker we must not pucker you must not pucker they must not pucker	I must not be puckering you must not be puckering he must not be puckering we must not be puckering you must not be puckering they must not be puckering
Perfect	V-ing perfect
I must not have puckered you must not have puckered he must not have puckered we must not have puckered you must not have puckered they must not have puckered	I must not have been puckering you must not have been puckering he must not have been puckering we must not have been puckering you must not have been puckering they must not have been puckering

Interrogative form

Simple form	V-ing form
must I pucker? must you pucker? must he pucker? must we pucker? must you pucker? must they pucker?	must I be puckering? must you be puckering? must he be puckering? must we be puckering? must you be puckering? must they be puckering?
Perfect	V-ing perfect
must I have puckered? must you have puckered? must he have puckered? must we have puckered? must you have puckered? must they have puckered?	must I have been puckering? must you have been puckering? must he have been puckering? must we have been puckering? must you have been puckering? must they have been puckering?

Interro-negative form

Simple form	V-ing form
must I not pucker? must you not pucker? must he not pucker? must we not pucker? must you not pucker? must they not pucker?	must I not be puckering? must you not be puckering? must he not be puckering? must we not be puckering? must you not be puckering? must they not be puckering?
Perfect	V-ing perfect
must I not have puckered? must you not have puckered? must he not have puckered? must we not have puckered? must you not have puckered? must they not have puckered?	must I not have been puckering? must you not have been puckering? must he not have been puckering? must we not have been puckering? must you not have been puckering? must they not have been puckering?