I must crouch you must crouch he must crouch we must crouch you must crouch they must crouch
Forme en V-ing
I must be crouching you must be crouching he must be crouching we must be crouching you must be crouching they must be crouching
Perfect
I must have crouched you must have crouched he must have crouched we must have crouched you must have crouched they must have crouched
Perfect en V-ing
I must have been crouching you must have been crouching he must have been crouching we must have been crouching you must have been crouching they must have been crouching
Négation
Forme simple
I mustn't crouch you mustn't crouch he mustn't crouch we mustn't crouch you mustn't crouch they mustn't crouch
Forme en V-ing
I mustn't be crouching you mustn't be crouching he mustn't be crouching we mustn't be crouching you mustn't be crouching they mustn't be crouching
Perfect
I mustn't have crouched you mustn't have crouched he mustn't have crouched we mustn't have crouched you mustn't have crouched they mustn't have crouched
Perfect en V-ing
I mustn't have been crouching you mustn't have been crouching he mustn't have been crouching we mustn't have been crouching you mustn't have been crouching they mustn't have been crouching
Forme interrogative
Forme simple
must I crouch? must you crouch? must he crouch? must we crouch? must you crouch? must they crouch?
Forme en V-ing
must I be crouching? must you be crouching? must he be crouching? must we be crouching? must you be crouching? must they be crouching?
Perfect
must I have crouched? must you have crouched? must he have crouched? must we have crouched? must you have crouched? must they have crouched?
Perfect en V-ing
must I have been crouching? must you have been crouching? must he have been crouching? must we have been crouching? must you have been crouching? must they have been crouching?
Forme interro-négative
Forme simple
mustn't I crouch? mustn't you crouch? mustn't he crouch? mustn't we crouch? mustn't you crouch? mustn't they crouch?
Forme en V-ing
mustn't I be crouching? mustn't you be crouching? mustn't he be crouching? mustn't we be crouching? mustn't you be crouching? mustn't they be crouching?
Perfect
mustn't I have crouched? mustn't you have crouched? mustn't he have crouched? mustn't we have crouched? mustn't you have crouched? mustn't they have crouched?
Perfect en V-ing
mustn't I have been crouching? mustn't you have been crouching? mustn't he have been crouching? mustn't we have been crouching? mustn't you have been crouching? mustn't they have been crouching?