English verb conjugation
MUST CREASE

Regular verb: crease - creased - creased

Affirmation

Simple form	V-ing form
I must crease you must crease he must crease we must crease you must crease they must crease	I must be creasing you must be creasing he must be creasing we must be creasing you must be creasing they must be creasing
Perfect	V-ing perfect
I must have creased you must have creased he must have creased we must have creased you must have creased they must have creased	I must have been creasing you must have been creasing he must have been creasing we must have been creasing you must have been creasing they must have been creasing

Negation

Simple form	V-ing form
I must not crease you must not crease he must not crease we must not crease you must not crease they must not crease	I must not be creasing you must not be creasing he must not be creasing we must not be creasing you must not be creasing they must not be creasing
Perfect	V-ing perfect
I must not have creased you must not have creased he must not have creased we must not have creased you must not have creased they must not have creased	I must not have been creasing you must not have been creasing he must not have been creasing we must not have been creasing you must not have been creasing they must not have been creasing

Interrogative form

Simple form	V-ing form
must I crease? must you crease? must he crease? must we crease? must you crease? must they crease?	must I be creasing? must you be creasing? must he be creasing? must we be creasing? must you be creasing? must they be creasing?
Perfect	V-ing perfect
must I have creased? must you have creased? must he have creased? must we have creased? must you have creased? must they have creased?	must I have been creasing? must you have been creasing? must he have been creasing? must we have been creasing? must you have been creasing? must they have been creasing?

Interro-negative form

Simple form	V-ing form
must I not crease? must you not crease? must he not crease? must we not crease? must you not crease? must they not crease?	must I not be creasing? must you not be creasing? must he not be creasing? must we not be creasing? must you not be creasing? must they not be creasing?
Perfect	V-ing perfect
must I not have creased? must you not have creased? must he not have creased? must we not have creased? must you not have creased? must they not have creased?	must I not have been creasing? must you not have been creasing? must he not have been creasing? must we not have been creasing? must you not have been creasing? must they not have been creasing?