must preshape
Regular verb: preshape - preshaped- preshaped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must preshape
you must preshape
he must preshape
we must preshape
you must preshape
they must preshape 	I must be preshaping
you must be preshaping
he must be preshaping
we must be preshaping
you must be preshaping
they must be preshaping	I must have preshaped
you must have preshaped
he must have preshaped
we must have preshaped
you must have preshaped
they must have preshaped	I must have been preshaping
you must have been preshaping
he must have been preshaping
we must have been preshaping
you must have been preshaping
they must have been preshaping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't preshape
you mustn't preshape
he mustn't preshape
we mustn't preshape
you mustn't preshape
they mustn't preshape 	I mustn't be preshaping
you mustn't be preshaping
he mustn't be preshaping
we mustn't be preshaping
you mustn't be preshaping
they mustn't be preshaping	I mustn't have preshaped
you mustn't have preshaped
he mustn't have preshaped
we mustn't have preshaped
you mustn't have preshaped
they mustn't have preshaped	I mustn't have been preshaping
you mustn't have been preshaping
he mustn't have been preshaping
we mustn't have been preshaping
you mustn't have been preshaping
they mustn't have been preshaping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I preshape?
must you preshape?
must he preshape?
must we preshape?
must you preshape?
must they preshape? 	must I be preshaping?
must you be preshaping?
must he be preshaping?
must we be preshaping?
must you be preshaping?
must they be preshaping? 	must I have preshaped?
must you have preshaped?
must he have preshaped?
must we have preshaped?
must you have preshaped?
must they have preshaped? 	must I have been preshaping?
must you have been preshaping?
must he have been preshaping?
must we have been preshaping?
must you have been preshaping?
must they have been preshaping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I preshape?
mustn't you preshape?
mustn't he preshape?
mustn't we preshape?
mustn't you preshape?
mustn't they preshape? 	mustn't I be preshaping?
mustn't you be preshaping?
mustn't he be preshaping?
mustn't we be preshaping?
mustn't you be preshaping?
mustn't they be preshaping? 	mustn't I have preshaped?
mustn't you have preshaped?
mustn't he have preshaped?
mustn't we have preshaped?
mustn't you have preshaped?
mustn't they have preshaped? 	mustn't I have been preshaping?
mustn't you have been preshaping?
mustn't he have been preshaping?
mustn't we have been preshaping?
mustn't you have been preshaping?
mustn't they have been preshaping?