English verb conjugation
COULD OVERDUB

Regular verb: overdub - overdubed - overdubed

Affirmation

Simple form	V-ing form
I could overdub you could overdub he could overdub we could overdub you could overdub they could overdub	I could be overdubing you could be overdubing he could be overdubing we could be overdubing you could be overdubing they could be overdubing
Perfect	V-ing perfect
I could have overdubed you could have overdubed he could have overdubed we could have overdubed you could have overdubed they could have overdubed	I could have been overdubing you could have been overdubing he could have been overdubing we could have been overdubing you could have been overdubing they could have been overdubing

Negation

Simple form	V-ing form
I couldn't overdub you couldn't overdub he couldn't overdub we couldn't overdub you couldn't overdub they couldn't overdub	I couldn't be overdubing you couldn't be overdubing he couldn't be overdubing we couldn't be overdubing you couldn't be overdubing they couldn't be overdubing
Perfect	V-ing perfect
I couldn't have overdubed you couldn't have overdubed he couldn't have overdubed we couldn't have overdubed you couldn't have overdubed they couldn't have overdubed	I couldn't have been overdubing you couldn't have been overdubing he couldn't have been overdubing we couldn't have been overdubing you couldn't have been overdubing they couldn't have been overdubing

Interrogative form

Simple form	V-ing form
could I overdub? could you overdub? could he overdub? could we overdub? could you overdub? could they overdub?	could I be overdubing? could you be overdubing? could he be overdubing? could we be overdubing? could you be overdubing? could they be overdubing?
Perfect	V-ing perfect
could I have overdubed? could you have overdubed? could he have overdubed? could we have overdubed? could you have overdubed? could they have overdubed?	could I have been overdubing? could you have been overdubing? could he have been overdubing? could we have been overdubing? could you have been overdubing? could they have been overdubing?

Interro-negative form

Simple form	V-ing form
couldn't I overdub? couldn't you overdub? couldn't he overdub? couldn't we overdub? couldn't you overdub? couldn't they overdub?	couldn't I be overdubing? couldn't you be overdubing? couldn't he be overdubing? couldn't we be overdubing? couldn't you be overdubing? couldn't they be overdubing?
Perfect	V-ing perfect
couldn't I have overdubed? couldn't you have overdubed? couldn't he have overdubed? couldn't we have overdubed? couldn't you have overdubed? couldn't they have overdubed?	couldn't I have been overdubing? couldn't you have been overdubing? couldn't he have been overdubing? couldn't we have been overdubing? couldn't you have been overdubing? couldn't they have been overdubing?