could dub
Regular verb: dub - dubbed- dubbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could dub
you could dub
he could dub
we could dub
you could dub
they could dub 	I could be dubbing
you could be dubbing
he could be dubbing
we could be dubbing
you could be dubbing
they could be dubbing	I could have dubbed
you could have dubbed
he could have dubbed
we could have dubbed
you could have dubbed
they could have dubbed	I could have been dubbing
you could have been dubbing
he could have been dubbing
we could have been dubbing
you could have been dubbing
they could have been dubbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not dub
you could not dub
he could not dub
we could not dub
you could not dub
they could not dub 	I could not be dubbing
you could not be dubbing
he could not be dubbing
we could not be dubbing
you could not be dubbing
they could not be dubbing	I could not have dubbed
you could not have dubbed
he could not have dubbed
we could not have dubbed
you could not have dubbed
they could not have dubbed	I could not have been dubbing
you could not have been dubbing
he could not have been dubbing
we could not have been dubbing
you could not have been dubbing
they could not have been dubbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I dub?
could you dub?
could he dub?
could we dub?
could you dub?
could they dub? 	could I be dubbing?
could you be dubbing?
could he be dubbing?
could we be dubbing?
could you be dubbing?
could they be dubbing? 	could I have dubbed?
could you have dubbed?
could he have dubbed?
could we have dubbed?
could you have dubbed?
could they have dubbed? 	could I have been dubbing?
could you have been dubbing?
could he have been dubbing?
could we have been dubbing?
could you have been dubbing?
could they have been dubbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not dub?
could you not dub?
could he not dub?
could we not dub?
could you not dub?
could they not dub? 	could I not be dubbing?
could you not be dubbing?
could he not be dubbing?
could we not be dubbing?
could you not be dubbing?
could they not be dubbing? 	could I not have dubbed?
could you not have dubbed?
could he not have dubbed?
could we not have dubbed?
could you not have dubbed?
could they not have dubbed? 	could I not have been dubbing?
could you not have been dubbing?
could he not have been dubbing?
could we not have been dubbing?
could you not have been dubbing?
could they not have been dubbing?