must precertify
Regular verb: precertify - precertified- precertified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must precertify
you must precertify
she must precertify
we must precertify
you must precertify
they must precertify 	I must be precertifying
you must be precertifying
she must be precertifying
we must be precertifying
you must be precertifying
they must be precertifying	I must have precertified
you must have precertified
she must have precertified
we must have precertified
you must have precertified
they must have precertified	I must have been precertifying
you must have been precertifying
she must have been precertifying
we must have been precertifying
you must have been precertifying
they must have been precertifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not precertify
you must not precertify
she must not precertify
we must not precertify
you must not precertify
they must not precertify 	I must not be precertifying
you must not be precertifying
she must not be precertifying
we must not be precertifying
you must not be precertifying
they must not be precertifying	I must not have precertified
you must not have precertified
she must not have precertified
we must not have precertified
you must not have precertified
they must not have precertified	I must not have been precertifying
you must not have been precertifying
she must not have been precertifying
we must not have been precertifying
you must not have been precertifying
they must not have been precertifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I precertify?
must you precertify?
must she precertify?
must we precertify?
must you precertify?
must they precertify? 	must I be precertifying?
must you be precertifying?
must she be precertifying?
must we be precertifying?
must you be precertifying?
must they be precertifying? 	must I have precertified?
must you have precertified?
must she have precertified?
must we have precertified?
must you have precertified?
must they have precertified? 	must I have been precertifying?
must you have been precertifying?
must she have been precertifying?
must we have been precertifying?
must you have been precertifying?
must they have been precertifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not precertify?
must you not precertify?
must she not precertify?
must we not precertify?
must you not precertify?
must they not precertify? 	must I not be precertifying?
must you not be precertifying?
must she not be precertifying?
must we not be precertifying?
must you not be precertifying?
must they not be precertifying? 	must I not have precertified?
must you not have precertified?
must she not have precertified?
must we not have precertified?
must you not have precertified?
must they not have precertified? 	must I not have been precertifying?
must you not have been precertifying?
must she not have been precertifying?
must we not have been precertifying?
must you not have been precertifying?
must they not have been precertifying?