I must nicker you must nicker she must nicker we must nicker you must nicker they must nicker
V-ing form
I must be nickering you must be nickering she must be nickering we must be nickering you must be nickering they must be nickering
Perfect
I must have nickered you must have nickered she must have nickered we must have nickered you must have nickered they must have nickered
V-ing perfect
I must have been nickering you must have been nickering she must have been nickering we must have been nickering you must have been nickering they must have been nickering
Negation
Simple form
I must not nicker you must not nicker she must not nicker we must not nicker you must not nicker they must not nicker
V-ing form
I must not be nickering you must not be nickering she must not be nickering we must not be nickering you must not be nickering they must not be nickering
Perfect
I must not have nickered you must not have nickered she must not have nickered we must not have nickered you must not have nickered they must not have nickered
V-ing perfect
I must not have been nickering you must not have been nickering she must not have been nickering we must not have been nickering you must not have been nickering they must not have been nickering
Interrogative form
Simple form
must I nicker? must you nicker? must she nicker? must we nicker? must you nicker? must they nicker?
V-ing form
must I be nickering? must you be nickering? must she be nickering? must we be nickering? must you be nickering? must they be nickering?
Perfect
must I have nickered? must you have nickered? must she have nickered? must we have nickered? must you have nickered? must they have nickered?
V-ing perfect
must I have been nickering? must you have been nickering? must she have been nickering? must we have been nickering? must you have been nickering? must they have been nickering?
Interro-negative form
Simple form
must I not nicker? must you not nicker? must she not nicker? must we not nicker? must you not nicker? must they not nicker?
V-ing form
must I not be nickering? must you not be nickering? must she not be nickering? must we not be nickering? must you not be nickering? must they not be nickering?
Perfect
must I not have nickered? must you not have nickered? must she not have nickered? must we not have nickered? must you not have nickered? must they not have nickered?
V-ing perfect
must I not have been nickering? must you not have been nickering? must she not have been nickering? must we not have been nickering? must you not have been nickering? must they not have been nickering?