I must stutter you must stutter he must stutter we must stutter you must stutter they must stutter
V-ing form
I must be stuttering you must be stuttering he must be stuttering we must be stuttering you must be stuttering they must be stuttering
Perfect
I must have stuttered you must have stuttered he must have stuttered we must have stuttered you must have stuttered they must have stuttered
V-ing perfect
I must have been stuttering you must have been stuttering he must have been stuttering we must have been stuttering you must have been stuttering they must have been stuttering
Negation
Simple form
I must not stutter you must not stutter he must not stutter we must not stutter you must not stutter they must not stutter
V-ing form
I must not be stuttering you must not be stuttering he must not be stuttering we must not be stuttering you must not be stuttering they must not be stuttering
Perfect
I must not have stuttered you must not have stuttered he must not have stuttered we must not have stuttered you must not have stuttered they must not have stuttered
V-ing perfect
I must not have been stuttering you must not have been stuttering he must not have been stuttering we must not have been stuttering you must not have been stuttering they must not have been stuttering
Interrogative form
Simple form
must I stutter? must you stutter? must he stutter? must we stutter? must you stutter? must they stutter?
V-ing form
must I be stuttering? must you be stuttering? must he be stuttering? must we be stuttering? must you be stuttering? must they be stuttering?
Perfect
must I have stuttered? must you have stuttered? must he have stuttered? must we have stuttered? must you have stuttered? must they have stuttered?
V-ing perfect
must I have been stuttering? must you have been stuttering? must he have been stuttering? must we have been stuttering? must you have been stuttering? must they have been stuttering?
Interro-negative form
Simple form
must I not stutter? must you not stutter? must he not stutter? must we not stutter? must you not stutter? must they not stutter?
V-ing form
must I not be stuttering? must you not be stuttering? must he not be stuttering? must we not be stuttering? must you not be stuttering? must they not be stuttering?
Perfect
must I not have stuttered? must you not have stuttered? must he not have stuttered? must we not have stuttered? must you not have stuttered? must they not have stuttered?
V-ing perfect
must I not have been stuttering? must you not have been stuttering? must he not have been stuttering? must we not have been stuttering? must you not have been stuttering? must they not have been stuttering?