I must whisper you must whisper she must whisper we must whisper you must whisper they must whisper
V-ing form
I must be whispering you must be whispering she must be whispering we must be whispering you must be whispering they must be whispering
Perfect
I must have whispered you must have whispered she must have whispered we must have whispered you must have whispered they must have whispered
V-ing perfect
I must have been whispering you must have been whispering she must have been whispering we must have been whispering you must have been whispering they must have been whispering
Negation
Simple form
I must not whisper you must not whisper she must not whisper we must not whisper you must not whisper they must not whisper
V-ing form
I must not be whispering you must not be whispering she must not be whispering we must not be whispering you must not be whispering they must not be whispering
Perfect
I must not have whispered you must not have whispered she must not have whispered we must not have whispered you must not have whispered they must not have whispered
V-ing perfect
I must not have been whispering you must not have been whispering she must not have been whispering we must not have been whispering you must not have been whispering they must not have been whispering
Interrogative form
Simple form
must I whisper? must you whisper? must she whisper? must we whisper? must you whisper? must they whisper?
V-ing form
must I be whispering? must you be whispering? must she be whispering? must we be whispering? must you be whispering? must they be whispering?
Perfect
must I have whispered? must you have whispered? must she have whispered? must we have whispered? must you have whispered? must they have whispered?
V-ing perfect
must I have been whispering? must you have been whispering? must she have been whispering? must we have been whispering? must you have been whispering? must they have been whispering?
Interro-negative form
Simple form
must I not whisper? must you not whisper? must she not whisper? must we not whisper? must you not whisper? must they not whisper?
V-ing form
must I not be whispering? must you not be whispering? must she not be whispering? must we not be whispering? must you not be whispering? must they not be whispering?
Perfect
must I not have whispered? must you not have whispered? must she not have whispered? must we not have whispered? must you not have whispered? must they not have whispered?
V-ing perfect
must I not have been whispering? must you not have been whispering? must she not have been whispering? must we not have been whispering? must you not have been whispering? must they not have been whispering?