can teleconference
Regular verb: teleconference - teleconferenced- teleconferenced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can teleconference
you can teleconference
he can teleconference
we can teleconference
you can teleconference
they can teleconference 	I can be teleconferencing
you can be teleconferencing
he can be teleconferencing
we can be teleconferencing
you can be teleconferencing
they can be teleconferencing	I can have teleconferenced
you can have teleconferenced
he can have teleconferenced
we can have teleconferenced
you can have teleconferenced
they can have teleconferenced	I can have been teleconferencing
you can have been teleconferencing
he can have been teleconferencing
we can have been teleconferencing
you can have been teleconferencing
they can have been teleconferencing	

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

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