English verb conjugation
COULD DOVETAIL

Regular verb: dovetail - dovetailed - dovetailed

Affirmation

Simple form	V-ing form
I could dovetail you could dovetail she could dovetail we could dovetail you could dovetail they could dovetail	I could be dovetailing you could be dovetailing she 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 she 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 she 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 couldn't dovetail you couldn't dovetail she couldn't dovetail we couldn't dovetail you couldn't dovetail they couldn't dovetail	I couldn't be dovetailing you couldn't be dovetailing she couldn't be dovetailing we couldn't be dovetailing you couldn't be dovetailing they couldn't be dovetailing
Perfect	V-ing perfect
I couldn't have dovetailed you couldn't have dovetailed she couldn't have dovetailed we couldn't have dovetailed you couldn't have dovetailed they couldn't have dovetailed	I couldn't have been dovetailing you couldn't have been dovetailing she couldn't have been dovetailing we couldn't have been dovetailing you couldn't have been dovetailing they couldn't have been dovetailing

Interrogative form

Simple form	V-ing form
could I dovetail? could you dovetail? could she dovetail? could we dovetail? could you dovetail? could they dovetail?	could I be dovetailing? could you be dovetailing? could she 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 she 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 she 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
couldn't I dovetail? couldn't you dovetail? couldn't she dovetail? couldn't we dovetail? couldn't you dovetail? couldn't they dovetail?	couldn't I be dovetailing? couldn't you be dovetailing? couldn't she be dovetailing? couldn't we be dovetailing? couldn't you be dovetailing? couldn't they be dovetailing?
Perfect	V-ing perfect
couldn't I have dovetailed? couldn't you have dovetailed? couldn't she have dovetailed? couldn't we have dovetailed? couldn't you have dovetailed? couldn't they have dovetailed?	couldn't I have been dovetailing? couldn't you have been dovetailing? couldn't she have been dovetailing? couldn't we have been dovetailing? couldn't you have been dovetailing? couldn't they have been dovetailing?