must preassemble
Regular verb: preassemble - preassembled- preassembled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must preassemble
you must preassemble
he must preassemble
we must preassemble
you must preassemble
they must preassemble 	I must be preassembling
you must be preassembling
he must be preassembling
we must be preassembling
you must be preassembling
they must be preassembling	I must have preassembled
you must have preassembled
he must have preassembled
we must have preassembled
you must have preassembled
they must have preassembled	I must have been preassembling
you must have been preassembling
he must have been preassembling
we must have been preassembling
you must have been preassembling
they must have been preassembling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't preassemble
you mustn't preassemble
he mustn't preassemble
we mustn't preassemble
you mustn't preassemble
they mustn't preassemble 	I mustn't be preassembling
you mustn't be preassembling
he mustn't be preassembling
we mustn't be preassembling
you mustn't be preassembling
they mustn't be preassembling	I mustn't have preassembled
you mustn't have preassembled
he mustn't have preassembled
we mustn't have preassembled
you mustn't have preassembled
they mustn't have preassembled	I mustn't have been preassembling
you mustn't have been preassembling
he mustn't have been preassembling
we mustn't have been preassembling
you mustn't have been preassembling
they mustn't have been preassembling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I preassemble?
must you preassemble?
must he preassemble?
must we preassemble?
must you preassemble?
must they preassemble? 	must I be preassembling?
must you be preassembling?
must he be preassembling?
must we be preassembling?
must you be preassembling?
must they be preassembling? 	must I have preassembled?
must you have preassembled?
must he have preassembled?
must we have preassembled?
must you have preassembled?
must they have preassembled? 	must I have been preassembling?
must you have been preassembling?
must he have been preassembling?
must we have been preassembling?
must you have been preassembling?
must they have been preassembling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I preassemble?
mustn't you preassemble?
mustn't he preassemble?
mustn't we preassemble?
mustn't you preassemble?
mustn't they preassemble? 	mustn't I be preassembling?
mustn't you be preassembling?
mustn't he be preassembling?
mustn't we be preassembling?
mustn't you be preassembling?
mustn't they be preassembling? 	mustn't I have preassembled?
mustn't you have preassembled?
mustn't he have preassembled?
mustn't we have preassembled?
mustn't you have preassembled?
mustn't they have preassembled? 	mustn't I have been preassembling?
mustn't you have been preassembling?
mustn't he have been preassembling?
mustn't we have been preassembling?
mustn't you have been preassembling?
mustn't they have been preassembling?