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 couldn't umber you couldn't umber he couldn't umber we couldn't umber you couldn't umber they couldn't umber	I couldn't be umbering you couldn't be umbering he couldn't be umbering we couldn't be umbering you couldn't be umbering they couldn't be umbering
Perfect	V-ing perfect
I couldn't have umbered you couldn't have umbered he couldn't have umbered we couldn't have umbered you couldn't have umbered they couldn't have umbered	I couldn't have been umbering you couldn't have been umbering he couldn't have been umbering we couldn't have been umbering you couldn't have been umbering they couldn't 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
couldn't I umber? couldn't you umber? couldn't he umber? couldn't we umber? couldn't you umber? couldn't they umber?	couldn't I be umbering? couldn't you be umbering? couldn't he be umbering? couldn't we be umbering? couldn't you be umbering? couldn't they be umbering?
Perfect	V-ing perfect
couldn't I have umbered? couldn't you have umbered? couldn't he have umbered? couldn't we have umbered? couldn't you have umbered? couldn't they have umbered?	couldn't I have been umbering? couldn't you have been umbering? couldn't he have been umbering? couldn't we have been umbering? couldn't you have been umbering? couldn't they have been umbering?