must wrinkle
Regular verb: wrinkle - wrinkled- wrinkled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must wrinkle
you must wrinkle
she must wrinkle
we must wrinkle
you must wrinkle
they must wrinkle 	I must be wrinkling
you must be wrinkling
she must be wrinkling
we must be wrinkling
you must be wrinkling
they must be wrinkling	I must have wrinkled
you must have wrinkled
she must have wrinkled
we must have wrinkled
you must have wrinkled
they must have wrinkled	I must have been wrinkling
you must have been wrinkling
she must have been wrinkling
we must have been wrinkling
you must have been wrinkling
they must have been wrinkling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't wrinkle
you mustn't wrinkle
she mustn't wrinkle
we mustn't wrinkle
you mustn't wrinkle
they mustn't wrinkle 	I mustn't be wrinkling
you mustn't be wrinkling
she mustn't be wrinkling
we mustn't be wrinkling
you mustn't be wrinkling
they mustn't be wrinkling	I mustn't have wrinkled
you mustn't have wrinkled
she mustn't have wrinkled
we mustn't have wrinkled
you mustn't have wrinkled
they mustn't have wrinkled	I mustn't have been wrinkling
you mustn't have been wrinkling
she mustn't have been wrinkling
we mustn't have been wrinkling
you mustn't have been wrinkling
they mustn't have been wrinkling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I wrinkle?
must you wrinkle?
must she wrinkle?
must we wrinkle?
must you wrinkle?
must they wrinkle? 	must I be wrinkling?
must you be wrinkling?
must she be wrinkling?
must we be wrinkling?
must you be wrinkling?
must they be wrinkling? 	must I have wrinkled?
must you have wrinkled?
must she have wrinkled?
must we have wrinkled?
must you have wrinkled?
must they have wrinkled? 	must I have been wrinkling?
must you have been wrinkling?
must she have been wrinkling?
must we have been wrinkling?
must you have been wrinkling?
must they have been wrinkling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I wrinkle?
mustn't you wrinkle?
mustn't she wrinkle?
mustn't we wrinkle?
mustn't you wrinkle?
mustn't they wrinkle? 	mustn't I be wrinkling?
mustn't you be wrinkling?
mustn't she be wrinkling?
mustn't we be wrinkling?
mustn't you be wrinkling?
mustn't they be wrinkling? 	mustn't I have wrinkled?
mustn't you have wrinkled?
mustn't she have wrinkled?
mustn't we have wrinkled?
mustn't you have wrinkled?
mustn't they have wrinkled? 	mustn't I have been wrinkling?
mustn't you have been wrinkling?
mustn't she have been wrinkling?
mustn't we have been wrinkling?
mustn't you have been wrinkling?
mustn't they have been wrinkling?