I must crouch you must crouch she must crouch we must crouch you must crouch they must crouch
Forma con V-ing
I must be crouching you must be crouching she must be crouching we must be crouching you must be crouching they must be crouching
Perfecto
I must have crouched you must have crouched she must have crouched we must have crouched you must have crouched they must have crouched
Perfecto con V-ing
I must have been crouching you must have been crouching she must have been crouching we must have been crouching you must have been crouching they must have been crouching
Negación
Forma simple
I mustn't crouch you mustn't crouch she mustn't crouch we mustn't crouch you mustn't crouch they mustn't crouch
Forma con V-ing
I mustn't be crouching you mustn't be crouching she mustn't be crouching we mustn't be crouching you mustn't be crouching they mustn't be crouching
Perfecto
I mustn't have crouched you mustn't have crouched she mustn't have crouched we mustn't have crouched you mustn't have crouched they mustn't have crouched
Perfecto con V-ing
I mustn't have been crouching you mustn't have been crouching she mustn't have been crouching we mustn't have been crouching you mustn't have been crouching they mustn't have been crouching
Forma interrogativa
Forma simple
must I crouch? must you crouch? must she crouch? must we crouch? must you crouch? must they crouch?
Forma con V-ing
must I be crouching? must you be crouching? must she be crouching? must we be crouching? must you be crouching? must they be crouching?
Perfecto
must I have crouched? must you have crouched? must she have crouched? must we have crouched? must you have crouched? must they have crouched?
Perfecto con V-ing
must I have been crouching? must you have been crouching? must she have been crouching? must we have been crouching? must you have been crouching? must they have been crouching?
Forma interro-negativa
Forma simple
mustn't I crouch? mustn't you crouch? mustn't she crouch? mustn't we crouch? mustn't you crouch? mustn't they crouch?
Forma con V-ing
mustn't I be crouching? mustn't you be crouching? mustn't she be crouching? mustn't we be crouching? mustn't you be crouching? mustn't they be crouching?
Perfecto
mustn't I have crouched? mustn't you have crouched? mustn't she have crouched? mustn't we have crouched? mustn't you have crouched? mustn't they have crouched?
Perfecto con V-ing
mustn't I have been crouching? mustn't you have been crouching? mustn't she have been crouching? mustn't we have been crouching? mustn't you have been crouching? mustn't they have been crouching?