I must lip-sync you must lip-sync she must lip-sync we must lip-sync you must lip-sync they must lip-sync
V-ing form
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
Perfect
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
V-ing perfect
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
I must not lip-sync you must not lip-sync she must not lip-sync we must not lip-sync you must not lip-sync they must not lip-sync
V-ing form
I must not be lip-syncing you must not be lip-syncing she must not be lip-syncing we must not be lip-syncing you must not be lip-syncing they must not be lip-syncing
Perfect
I must not have lip-synced you must not have lip-synced she must not have lip-synced we must not have lip-synced you must not have lip-synced they must not have lip-synced
V-ing perfect
I must not have been lip-syncing you must not have been lip-syncing she must not have been lip-syncing we must not have been lip-syncing you must not have been lip-syncing they must not have been lip-syncing
Interrogative form
Simple form
must I lip-sync? must you lip-sync? must she lip-sync? must we lip-sync? must you lip-sync? must they lip-sync?
V-ing form
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?
Perfect
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?
V-ing perfect
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
must I not lip-sync? must you not lip-sync? must she not lip-sync? must we not lip-sync? must you not lip-sync? must they not lip-sync?
V-ing form
must I not be lip-syncing? must you not be lip-syncing? must she not be lip-syncing? must we not be lip-syncing? must you not be lip-syncing? must they not be lip-syncing?
Perfect
must I not have lip-synced? must you not have lip-synced? must she not have lip-synced? must we not have lip-synced? must you not have lip-synced? must they not have lip-synced?
V-ing perfect
must I not have been lip-syncing? must you not have been lip-syncing? must she not have been lip-syncing? must we not have been lip-syncing? must you not have been lip-syncing? must they not have been lip-syncing?