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