I could teleconference you could teleconference he could teleconference we could teleconference you could teleconference they could teleconference
V-ing form
I could be teleconferencing you could be teleconferencing he could be teleconferencing we could be teleconferencing you could be teleconferencing they could be teleconferencing
Perfect
I could have teleconferenced you could have teleconferenced he could have teleconferenced we could have teleconferenced you could have teleconferenced they could have teleconferenced
V-ing perfect
I could have been teleconferencing you could have been teleconferencing he could have been teleconferencing we could have been teleconferencing you could have been teleconferencing they could have been teleconferencing
Negation
Simple form
I could not teleconference you could not teleconference he could not teleconference we could not teleconference you could not teleconference they could not teleconference
V-ing form
I could not be teleconferencing you could not be teleconferencing he could not be teleconferencing we could not be teleconferencing you could not be teleconferencing they could not be teleconferencing
Perfect
I could not have teleconferenced you could not have teleconferenced he could not have teleconferenced we could not have teleconferenced you could not have teleconferenced they could not have teleconferenced
V-ing perfect
I could not have been teleconferencing you could not have been teleconferencing he could not have been teleconferencing we could not have been teleconferencing you could not have been teleconferencing they could not have been teleconferencing
Interrogative form
Simple form
could I teleconference? could you teleconference? could he teleconference? could we teleconference? could you teleconference? could they teleconference?
V-ing form
could I be teleconferencing? could you be teleconferencing? could he be teleconferencing? could we be teleconferencing? could you be teleconferencing? could they be teleconferencing?
Perfect
could I have teleconferenced? could you have teleconferenced? could he have teleconferenced? could we have teleconferenced? could you have teleconferenced? could they have teleconferenced?
V-ing perfect
could I have been teleconferencing? could you have been teleconferencing? could he have been teleconferencing? could we have been teleconferencing? could you have been teleconferencing? could they have been teleconferencing?
Interro-negative form
Simple form
could I not teleconference? could you not teleconference? could he not teleconference? could we not teleconference? could you not teleconference? could they not teleconference?
V-ing form
could I not be teleconferencing? could you not be teleconferencing? could he not be teleconferencing? could we not be teleconferencing? could you not be teleconferencing? could they not be teleconferencing?
Perfect
could I not have teleconferenced? could you not have teleconferenced? could he not have teleconferenced? could we not have teleconferenced? could you not have teleconferenced? could they not have teleconferenced?
V-ing perfect
could I not have been teleconferencing? could you not have been teleconferencing? could he not have been teleconferencing? could we not have been teleconferencing? could you not have been teleconferencing? could they not have been teleconferencing?