must lip-sync
Regular verb: lip-sync - lip-synced- lip-synced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must lip-sync
you must lip-sync
she must lip-sync
we must lip-sync
you must lip-sync
they must lip-sync 	I must be lip-syncing
you must be lip-syncing
she must be lip-syncing
we must be lip-syncing
you must be lip-syncing
they must be lip-syncing	I must have lip-synced
you must have lip-synced
she must have lip-synced
we must have lip-synced
you must have lip-synced
they must have lip-synced	I must have been lip-syncing
you must have been lip-syncing
she must have been lip-syncing
we must have been lip-syncing
you must have been lip-syncing
they must have been lip-syncing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't lip-sync
you mustn't lip-sync
she mustn't lip-sync
we mustn't lip-sync
you mustn't lip-sync
they mustn't lip-sync 	I mustn't be lip-syncing
you mustn't be lip-syncing
she mustn't be lip-syncing
we mustn't be lip-syncing
you mustn't be lip-syncing
they mustn't be lip-syncing	I mustn't have lip-synced
you mustn't have lip-synced
she mustn't have lip-synced
we mustn't have lip-synced
you mustn't have lip-synced
they mustn't have lip-synced	I mustn't have been lip-syncing
you mustn't have been lip-syncing
she mustn't have been lip-syncing
we mustn't have been lip-syncing
you mustn't have been lip-syncing
they mustn't have been lip-syncing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I lip-sync?
must you lip-sync?
must she lip-sync?
must we lip-sync?
must you lip-sync?
must they lip-sync? 	must I be lip-syncing?
must you be lip-syncing?
must she be lip-syncing?
must we be lip-syncing?
must you be lip-syncing?
must they be lip-syncing? 	must I have lip-synced?
must you have lip-synced?
must she have lip-synced?
must we have lip-synced?
must you have lip-synced?
must they have lip-synced? 	must I have been lip-syncing?
must you have been lip-syncing?
must she have been lip-syncing?
must we have been lip-syncing?
must you have been lip-syncing?
must they have been lip-syncing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I lip-sync?
mustn't you lip-sync?
mustn't she lip-sync?
mustn't we lip-sync?
mustn't you lip-sync?
mustn't they lip-sync? 	mustn't I be lip-syncing?
mustn't you be lip-syncing?
mustn't she be lip-syncing?
mustn't we be lip-syncing?
mustn't you be lip-syncing?
mustn't they be lip-syncing? 	mustn't I have lip-synced?
mustn't you have lip-synced?
mustn't she have lip-synced?
mustn't we have lip-synced?
mustn't you have lip-synced?
mustn't they have lip-synced? 	mustn't I have been lip-syncing?
mustn't you have been lip-syncing?
mustn't she have been lip-syncing?
mustn't we have been lip-syncing?
mustn't you have been lip-syncing?
mustn't they have been lip-syncing?