English verb conjugation
COULD TAPER

Regular verb: taper - tapered - tapered

Affirmation

Simple form	V-ing form
I could taper you could taper she could taper we could taper you could taper they could taper	I could be tapering you could be tapering she could be tapering we could be tapering you could be tapering they could be tapering
Perfect	V-ing perfect
I could have tapered you could have tapered she could have tapered we could have tapered you could have tapered they could have tapered	I could have been tapering you could have been tapering she could have been tapering we could have been tapering you could have been tapering they could have been tapering

Negation

Simple form	V-ing form
I couldn't taper you couldn't taper she couldn't taper we couldn't taper you couldn't taper they couldn't taper	I couldn't be tapering you couldn't be tapering she couldn't be tapering we couldn't be tapering you couldn't be tapering they couldn't be tapering
Perfect	V-ing perfect
I couldn't have tapered you couldn't have tapered she couldn't have tapered we couldn't have tapered you couldn't have tapered they couldn't have tapered	I couldn't have been tapering you couldn't have been tapering she couldn't have been tapering we couldn't have been tapering you couldn't have been tapering they couldn't have been tapering

Interrogative form

Simple form	V-ing form
could I taper? could you taper? could she taper? could we taper? could you taper? could they taper?	could I be tapering? could you be tapering? could she be tapering? could we be tapering? could you be tapering? could they be tapering?
Perfect	V-ing perfect
could I have tapered? could you have tapered? could she have tapered? could we have tapered? could you have tapered? could they have tapered?	could I have been tapering? could you have been tapering? could she have been tapering? could we have been tapering? could you have been tapering? could they have been tapering?

Interro-negative form

Simple form	V-ing form
couldn't I taper? couldn't you taper? couldn't she taper? couldn't we taper? couldn't you taper? couldn't they taper?	couldn't I be tapering? couldn't you be tapering? couldn't she be tapering? couldn't we be tapering? couldn't you be tapering? couldn't they be tapering?
Perfect	V-ing perfect
couldn't I have tapered? couldn't you have tapered? couldn't she have tapered? couldn't we have tapered? couldn't you have tapered? couldn't they have tapered?	couldn't I have been tapering? couldn't you have been tapering? couldn't she have been tapering? couldn't we have been tapering? couldn't you have been tapering? couldn't they have been tapering?