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