I can teleconference you can teleconference she can teleconference we can teleconference you can teleconference they can teleconference
V-ing form
I can be teleconferencing you can be teleconferencing she can be teleconferencing we can be teleconferencing you can be teleconferencing they can be teleconferencing
Perfect
I can have teleconferenced you can have teleconferenced she can have teleconferenced we can have teleconferenced you can have teleconferenced they can have teleconferenced
V-ing perfect
I can have been teleconferencing you can have been teleconferencing she can have been teleconferencing we can have been teleconferencing you can have been teleconferencing they can have been teleconferencing
Negation
Simple form
I can't teleconference you can't teleconference she can't teleconference we can't teleconference you can't teleconference they can't teleconference
V-ing form
I can't be teleconferencing you can't be teleconferencing she can't be teleconferencing we can't be teleconferencing you can't be teleconferencing they can't be teleconferencing
Perfect
I can't have teleconferenced you can't have teleconferenced she can't have teleconferenced we can't have teleconferenced you can't have teleconferenced they can't have teleconferenced
V-ing perfect
I can't have been teleconferencing you can't have been teleconferencing she can't have been teleconferencing we can't have been teleconferencing you can't have been teleconferencing they can't have been teleconferencing
Interrogative form
Simple form
can I teleconference? can you teleconference? can she teleconference? can we teleconference? can you teleconference? can they teleconference?
V-ing form
can I be teleconferencing? can you be teleconferencing? can she be teleconferencing? can we be teleconferencing? can you be teleconferencing? can they be teleconferencing?
Perfect
can I have teleconferenced? can you have teleconferenced? can she have teleconferenced? can we have teleconferenced? can you have teleconferenced? can they have teleconferenced?
V-ing perfect
can I have been teleconferencing? can you have been teleconferencing? can she have been teleconferencing? can we have been teleconferencing? can you have been teleconferencing? can they have been teleconferencing?
Interro-negative form
Simple form
can't I teleconference? can't you teleconference? can't she teleconference? can't we teleconference? can't you teleconference? can't they teleconference?
V-ing form
can't I be teleconferencing? can't you be teleconferencing? can't she be teleconferencing? can't we be teleconferencing? can't you be teleconferencing? can't they be teleconferencing?
Perfect
can't I have teleconferenced? can't you have teleconferenced? can't she have teleconferenced? can't we have teleconferenced? can't you have teleconferenced? can't they have teleconferenced?
V-ing perfect
can't I have been teleconferencing? can't you have been teleconferencing? can't she have been teleconferencing? can't we have been teleconferencing? can't you have been teleconferencing? can't they have been teleconferencing?