English verb conjugation
COULD DUB

Regular verb: dub - dubbed - dubbed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I couldn't dub you couldn't dub he couldn't dub we couldn't dub you couldn't dub they couldn't dub	I couldn't be dubbing you couldn't be dubbing he couldn't be dubbing we couldn't be dubbing you couldn't be dubbing they couldn't be dubbing
Perfect	V-ing perfect
I couldn't have dubbed you couldn't have dubbed he couldn't have dubbed we couldn't have dubbed you couldn't have dubbed they couldn't have dubbed	I couldn't have been dubbing you couldn't have been dubbing he couldn't have been dubbing we couldn't have been dubbing you couldn't have been dubbing they couldn't have been dubbing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
couldn't I dub? couldn't you dub? couldn't he dub? couldn't we dub? couldn't you dub? couldn't they dub?	couldn't I be dubbing? couldn't you be dubbing? couldn't he be dubbing? couldn't we be dubbing? couldn't you be dubbing? couldn't they be dubbing?
Perfect	V-ing perfect
couldn't I have dubbed? couldn't you have dubbed? couldn't he have dubbed? couldn't we have dubbed? couldn't you have dubbed? couldn't they have dubbed?	couldn't I have been dubbing? couldn't you have been dubbing? couldn't he have been dubbing? couldn't we have been dubbing? couldn't you have been dubbing? couldn't they have been dubbing?