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 must not preassemble
you must not preassemble
he must not preassemble
we must not preassemble
you must not preassemble
they must not preassemble 	I must not be preassembling
you must not be preassembling
he must not be preassembling
we must not be preassembling
you must not be preassembling
they must not be preassembling	I must not have preassembled
you must not have preassembled
he must not have preassembled
we must not have preassembled
you must not have preassembled
they must not have preassembled	I must not have been preassembling
you must not have been preassembling
he must not have been preassembling
we must not have been preassembling
you must not have been preassembling
they must not 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 	
must I not preassemble?
must you not preassemble?
must he not preassemble?
must we not preassemble?
must you not preassemble?
must they not preassemble? 	must I not be preassembling?
must you not be preassembling?
must he not be preassembling?
must we not be preassembling?
must you not be preassembling?
must they not be preassembling? 	must I not have preassembled?
must you not have preassembled?
must he not have preassembled?
must we not have preassembled?
must you not have preassembled?
must they not have preassembled? 	must I not have been preassembling?
must you not have been preassembling?
must he not have been preassembling?
must we not have been preassembling?
must you not have been preassembling?
must they not have been preassembling?