I must finger you must finger he must finger we must finger you must finger they must finger
V-ing form
I must be fingering you must be fingering he must be fingering we must be fingering you must be fingering they must be fingering
Perfect
I must have fingered you must have fingered he must have fingered we must have fingered you must have fingered they must have fingered
V-ing perfect
I must have been fingering you must have been fingering he must have been fingering we must have been fingering you must have been fingering they must have been fingering
Negation
Simple form
I mustn't finger you mustn't finger he mustn't finger we mustn't finger you mustn't finger they mustn't finger
V-ing form
I mustn't be fingering you mustn't be fingering he mustn't be fingering we mustn't be fingering you mustn't be fingering they mustn't be fingering
Perfect
I mustn't have fingered you mustn't have fingered he mustn't have fingered we mustn't have fingered you mustn't have fingered they mustn't have fingered
V-ing perfect
I mustn't have been fingering you mustn't have been fingering he mustn't have been fingering we mustn't have been fingering you mustn't have been fingering they mustn't have been fingering
Interrogative form
Simple form
must I finger? must you finger? must he finger? must we finger? must you finger? must they finger?
V-ing form
must I be fingering? must you be fingering? must he be fingering? must we be fingering? must you be fingering? must they be fingering?
Perfect
must I have fingered? must you have fingered? must he have fingered? must we have fingered? must you have fingered? must they have fingered?
V-ing perfect
must I have been fingering? must you have been fingering? must he have been fingering? must we have been fingering? must you have been fingering? must they have been fingering?
Interro-negative form
Simple form
mustn't I finger? mustn't you finger? mustn't he finger? mustn't we finger? mustn't you finger? mustn't they finger?
V-ing form
mustn't I be fingering? mustn't you be fingering? mustn't he be fingering? mustn't we be fingering? mustn't you be fingering? mustn't they be fingering?
Perfect
mustn't I have fingered? mustn't you have fingered? mustn't he have fingered? mustn't we have fingered? mustn't you have fingered? mustn't they have fingered?
V-ing perfect
mustn't I have been fingering? mustn't you have been fingering? mustn't he have been fingering? mustn't we have been fingering? mustn't you have been fingering? mustn't they have been fingering?