English verb conjugation
COULD LIP-SYNC

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

Affirmation

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