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 must not wrinkle
you must not wrinkle
she must not wrinkle
we must not wrinkle
you must not wrinkle
they must not wrinkle 	I must not be wrinkling
you must not be wrinkling
she must not be wrinkling
we must not be wrinkling
you must not be wrinkling
they must not be wrinkling	I must not have wrinkled
you must not have wrinkled
she must not have wrinkled
we must not have wrinkled
you must not have wrinkled
they must not have wrinkled	I must not have been wrinkling
you must not have been wrinkling
she must not have been wrinkling
we must not have been wrinkling
you must not have been wrinkling
they must not 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 	
must I not wrinkle?
must you not wrinkle?
must she not wrinkle?
must we not wrinkle?
must you not wrinkle?
must they not wrinkle? 	must I not be wrinkling?
must you not be wrinkling?
must she not be wrinkling?
must we not be wrinkling?
must you not be wrinkling?
must they not be wrinkling? 	must I not have wrinkled?
must you not have wrinkled?
must she not have wrinkled?
must we not have wrinkled?
must you not have wrinkled?
must they not have wrinkled? 	must I not have been wrinkling?
must you not have been wrinkling?
must she not have been wrinkling?
must we not have been wrinkling?
must you not have been wrinkling?
must they not have been wrinkling?