English verb conjugation
COULD UMBER

Regular verb: umber - umbered - umbered

Affirmation

Simple form	V-ing form
I could umber you could umber she could umber we could umber you could umber they could umber	I could be umbering you could be umbering she could be umbering we could be umbering you could be umbering they could be umbering
Perfect	V-ing perfect
I could have umbered you could have umbered she could have umbered we could have umbered you could have umbered they could have umbered	I could have been umbering you could have been umbering she could have been umbering we could have been umbering you could have been umbering they could have been umbering

Negation

Simple form	V-ing form
I could not umber you could not umber she could not umber we could not umber you could not umber they could not umber	I could not be umbering you could not be umbering she could not be umbering we could not be umbering you could not be umbering they could not be umbering
Perfect	V-ing perfect
I could not have umbered you could not have umbered she could not have umbered we could not have umbered you could not have umbered they could not have umbered	I could not have been umbering you could not have been umbering she could not have been umbering we could not have been umbering you could not have been umbering they could not have been umbering

Interrogative form

Simple form	V-ing form
could I umber? could you umber? could she umber? could we umber? could you umber? could they umber?	could I be umbering? could you be umbering? could she be umbering? could we be umbering? could you be umbering? could they be umbering?
Perfect	V-ing perfect
could I have umbered? could you have umbered? could she have umbered? could we have umbered? could you have umbered? could they have umbered?	could I have been umbering? could you have been umbering? could she have been umbering? could we have been umbering? could you have been umbering? could they have been umbering?

Interro-negative form

Simple form	V-ing form
could I not umber? could you not umber? could she not umber? could we not umber? could you not umber? could they not umber?	could I not be umbering? could you not be umbering? could she not be umbering? could we not be umbering? could you not be umbering? could they not be umbering?
Perfect	V-ing perfect
could I not have umbered? could you not have umbered? could she not have umbered? could we not have umbered? could you not have umbered? could they not have umbered?	could I not have been umbering? could you not have been umbering? could she not have been umbering? could we not have been umbering? could you not have been umbering? could they not have been umbering?