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