must precode
Regular verb: precode - precoded- precoded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must precode
you must precode
she must precode
we must precode
you must precode
they must precode 	I must be precoding
you must be precoding
she must be precoding
we must be precoding
you must be precoding
they must be precoding	I must have precoded
you must have precoded
she must have precoded
we must have precoded
you must have precoded
they must have precoded	I must have been precoding
you must have been precoding
she must have been precoding
we must have been precoding
you must have been precoding
they must have been precoding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not precode
you must not precode
she must not precode
we must not precode
you must not precode
they must not precode 	I must not be precoding
you must not be precoding
she must not be precoding
we must not be precoding
you must not be precoding
they must not be precoding	I must not have precoded
you must not have precoded
she must not have precoded
we must not have precoded
you must not have precoded
they must not have precoded	I must not have been precoding
you must not have been precoding
she must not have been precoding
we must not have been precoding
you must not have been precoding
they must not have been precoding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I precode?
must you precode?
must she precode?
must we precode?
must you precode?
must they precode? 	must I be precoding?
must you be precoding?
must she be precoding?
must we be precoding?
must you be precoding?
must they be precoding? 	must I have precoded?
must you have precoded?
must she have precoded?
must we have precoded?
must you have precoded?
must they have precoded? 	must I have been precoding?
must you have been precoding?
must she have been precoding?
must we have been precoding?
must you have been precoding?
must they have been precoding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not precode?
must you not precode?
must she not precode?
must we not precode?
must you not precode?
must they not precode? 	must I not be precoding?
must you not be precoding?
must she not be precoding?
must we not be precoding?
must you not be precoding?
must they not be precoding? 	must I not have precoded?
must you not have precoded?
must she not have precoded?
must we not have precoded?
must you not have precoded?
must they not have precoded? 	must I not have been precoding?
must you not have been precoding?
must she not have been precoding?
must we not have been precoding?
must you not have been precoding?
must they not have been precoding?