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