English verb conjugation
COULD DOVETAIL

Regular verb: dovetail - dovetailed - dovetailed

Affirmation

Simple form	V-ing form
I could dovetail you could dovetail he could dovetail we could dovetail you could dovetail they could dovetail	I could be dovetailing you could be dovetailing he could be dovetailing we could be dovetailing you could be dovetailing they could be dovetailing
Perfect	V-ing perfect
I could have dovetailed you could have dovetailed he could have dovetailed we could have dovetailed you could have dovetailed they could have dovetailed	I could have been dovetailing you could have been dovetailing he could have been dovetailing we could have been dovetailing you could have been dovetailing they could have been dovetailing

Negation

Simple form	V-ing form
I could not dovetail you could not dovetail he could not dovetail we could not dovetail you could not dovetail they could not dovetail	I could not be dovetailing you could not be dovetailing he could not be dovetailing we could not be dovetailing you could not be dovetailing they could not be dovetailing
Perfect	V-ing perfect
I could not have dovetailed you could not have dovetailed he could not have dovetailed we could not have dovetailed you could not have dovetailed they could not have dovetailed	I could not have been dovetailing you could not have been dovetailing he could not have been dovetailing we could not have been dovetailing you could not have been dovetailing they could not have been dovetailing

Interrogative form

Simple form	V-ing form
could I dovetail? could you dovetail? could he dovetail? could we dovetail? could you dovetail? could they dovetail?	could I be dovetailing? could you be dovetailing? could he be dovetailing? could we be dovetailing? could you be dovetailing? could they be dovetailing?
Perfect	V-ing perfect
could I have dovetailed? could you have dovetailed? could he have dovetailed? could we have dovetailed? could you have dovetailed? could they have dovetailed?	could I have been dovetailing? could you have been dovetailing? could he have been dovetailing? could we have been dovetailing? could you have been dovetailing? could they have been dovetailing?

Interro-negative form

Simple form	V-ing form
could I not dovetail? could you not dovetail? could he not dovetail? could we not dovetail? could you not dovetail? could they not dovetail?	could I not be dovetailing? could you not be dovetailing? could he not be dovetailing? could we not be dovetailing? could you not be dovetailing? could they not be dovetailing?
Perfect	V-ing perfect
could I not have dovetailed? could you not have dovetailed? could he not have dovetailed? could we not have dovetailed? could you not have dovetailed? could they not have dovetailed?	could I not have been dovetailing? could you not have been dovetailing? could he not have been dovetailing? could we not have been dovetailing? could you not have been dovetailing? could they not have been dovetailing?