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 mustn't crease you mustn't crease he mustn't crease we mustn't crease you mustn't crease they mustn't crease	I mustn't be creasing you mustn't be creasing he mustn't be creasing we mustn't be creasing you mustn't be creasing they mustn't be creasing
Perfect	V-ing perfect
I mustn't have creased you mustn't have creased he mustn't have creased we mustn't have creased you mustn't have creased they mustn't have creased	I mustn't have been creasing you mustn't have been creasing he mustn't have been creasing we mustn't have been creasing you mustn't have been creasing they mustn't 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
mustn't I crease? mustn't you crease? mustn't he crease? mustn't we crease? mustn't you crease? mustn't they crease?	mustn't I be creasing? mustn't you be creasing? mustn't he be creasing? mustn't we be creasing? mustn't you be creasing? mustn't they be creasing?
Perfect	V-ing perfect
mustn't I have creased? mustn't you have creased? mustn't he have creased? mustn't we have creased? mustn't you have creased? mustn't they have creased?	mustn't I have been creasing? mustn't you have been creasing? mustn't he have been creasing? mustn't we have been creasing? mustn't you have been creasing? mustn't they have been creasing?