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