English verb conjugation
COULD TAPER

Regular verb: taper - tapered - tapered

Affirmation

Simple form	V-ing form
I could taper you could taper he could taper we could taper you could taper they could taper	I could be tapering you could be tapering he 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 he 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 he 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 he 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 he 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 he 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 he 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 he taper? could we taper? could you taper? could they taper?	could I be tapering? could you be tapering? could he 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 he 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 he 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 he 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 he 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 he 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 he have been tapering? couldn't we have been tapering? couldn't you have been tapering? couldn't they have been tapering?