English verb conjugation
COULD SILVER

Regular verb: silver - silvered - silvered

Affirmation

Simple form	V-ing form
I could silver you could silver he could silver we could silver you could silver they could silver	I could be silvering you could be silvering he could be silvering we could be silvering you could be silvering they could be silvering
Perfect	V-ing perfect
I could have silvered you could have silvered he could have silvered we could have silvered you could have silvered they could have silvered	I could have been silvering you could have been silvering he could have been silvering we could have been silvering you could have been silvering they could have been silvering

Negation

Simple form	V-ing form
I couldn't silver you couldn't silver he couldn't silver we couldn't silver you couldn't silver they couldn't silver	I couldn't be silvering you couldn't be silvering he couldn't be silvering we couldn't be silvering you couldn't be silvering they couldn't be silvering
Perfect	V-ing perfect
I couldn't have silvered you couldn't have silvered he couldn't have silvered we couldn't have silvered you couldn't have silvered they couldn't have silvered	I couldn't have been silvering you couldn't have been silvering he couldn't have been silvering we couldn't have been silvering you couldn't have been silvering they couldn't have been silvering

Interrogative form

Simple form	V-ing form
could I silver? could you silver? could he silver? could we silver? could you silver? could they silver?	could I be silvering? could you be silvering? could he be silvering? could we be silvering? could you be silvering? could they be silvering?
Perfect	V-ing perfect
could I have silvered? could you have silvered? could he have silvered? could we have silvered? could you have silvered? could they have silvered?	could I have been silvering? could you have been silvering? could he have been silvering? could we have been silvering? could you have been silvering? could they have been silvering?

Interro-negative form

Simple form	V-ing form
couldn't I silver? couldn't you silver? couldn't he silver? couldn't we silver? couldn't you silver? couldn't they silver?	couldn't I be silvering? couldn't you be silvering? couldn't he be silvering? couldn't we be silvering? couldn't you be silvering? couldn't they be silvering?
Perfect	V-ing perfect
couldn't I have silvered? couldn't you have silvered? couldn't he have silvered? couldn't we have silvered? couldn't you have silvered? couldn't they have silvered?	couldn't I have been silvering? couldn't you have been silvering? couldn't he have been silvering? couldn't we have been silvering? couldn't you have been silvering? couldn't they have been silvering?