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