English verb conjugation
COULD UMBER

Regular verb: umber - umbered - umbered

Affirmation

Simple form	V-ing form
I could umber you could umber he could umber we could umber you could umber they could umber	I could be umbering you could be umbering he 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 he 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 he 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 he 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 he 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 he 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 he 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 he umber? could we umber? could you umber? could they umber?	could I be umbering? could you be umbering? could he 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 he 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 he 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 he 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 he 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 he 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 he not have been umbering? could we not have been umbering? could you not have been umbering? could they not have been umbering?