I can taper you can taper she can taper we can taper you can taper they can taper
V-ing form
I can be tapering you can be tapering she can be tapering we can be tapering you can be tapering they can be tapering
Perfect
I can have tapered you can have tapered she can have tapered we can have tapered you can have tapered they can have tapered
V-ing perfect
I can have been tapering you can have been tapering she can have been tapering we can have been tapering you can have been tapering they can have been tapering
Negation
Simple form
I cannot taper you cannot taper she cannot taper we cannot taper you cannot taper they cannot taper
V-ing form
I cannot be tapering you cannot be tapering she cannot be tapering we cannot be tapering you cannot be tapering they cannot be tapering
Perfect
I cannot have tapered you cannot have tapered she cannot have tapered we cannot have tapered you cannot have tapered they cannot have tapered
V-ing perfect
I cannot have been tapering you cannot have been tapering she cannot have been tapering we cannot have been tapering you cannot have been tapering they cannot have been tapering
Interrogative form
Simple form
can I taper? can you taper? can she taper? can we taper? can you taper? can they taper?
V-ing form
can I be tapering? can you be tapering? can she be tapering? can we be tapering? can you be tapering? can they be tapering?
Perfect
can I have tapered? can you have tapered? can she have tapered? can we have tapered? can you have tapered? can they have tapered?
V-ing perfect
can I have been tapering? can you have been tapering? can she have been tapering? can we have been tapering? can you have been tapering? can they have been tapering?
Interro-negative form
Simple form
can I not taper? can you not taper? can she not taper? can we not taper? can you not taper? can they not taper?
V-ing form
can I not be tapering? can you not be tapering? can she not be tapering? can we not be tapering? can you not be tapering? can they not be tapering?
Perfect
can I not have tapered? can you not have tapered? can she not have tapered? can we not have tapered? can you not have tapered? can they not have tapered?
V-ing perfect
can I not have been tapering? can you not have been tapering? can she not have been tapering? can we not have been tapering? can you not have been tapering? can they not have been tapering?