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