I must liaise you must liaise he must liaise we must liaise you must liaise they must liaise
Forma con V-ing
I must be liaising you must be liaising he must be liaising we must be liaising you must be liaising they must be liaising
Perfecto
I must have liaised you must have liaised he must have liaised we must have liaised you must have liaised they must have liaised
Perfecto con V-ing
I must have been liaising you must have been liaising he must have been liaising we must have been liaising you must have been liaising they must have been liaising
Negación
Forma simple
I mustn't liaise you mustn't liaise he mustn't liaise we mustn't liaise you mustn't liaise they mustn't liaise
Forma con V-ing
I mustn't be liaising you mustn't be liaising he mustn't be liaising we mustn't be liaising you mustn't be liaising they mustn't be liaising
Perfecto
I mustn't have liaised you mustn't have liaised he mustn't have liaised we mustn't have liaised you mustn't have liaised they mustn't have liaised
Perfecto con V-ing
I mustn't have been liaising you mustn't have been liaising he mustn't have been liaising we mustn't have been liaising you mustn't have been liaising they mustn't have been liaising
Forma interrogativa
Forma simple
must I liaise? must you liaise? must he liaise? must we liaise? must you liaise? must they liaise?
Forma con V-ing
must I be liaising? must you be liaising? must he be liaising? must we be liaising? must you be liaising? must they be liaising?
Perfecto
must I have liaised? must you have liaised? must he have liaised? must we have liaised? must you have liaised? must they have liaised?
Perfecto con V-ing
must I have been liaising? must you have been liaising? must he have been liaising? must we have been liaising? must you have been liaising? must they have been liaising?
Forma interro-negativa
Forma simple
mustn't I liaise? mustn't you liaise? mustn't he liaise? mustn't we liaise? mustn't you liaise? mustn't they liaise?
Forma con V-ing
mustn't I be liaising? mustn't you be liaising? mustn't he be liaising? mustn't we be liaising? mustn't you be liaising? mustn't they be liaising?
Perfecto
mustn't I have liaised? mustn't you have liaised? mustn't he have liaised? mustn't we have liaised? mustn't you have liaised? mustn't they have liaised?
Perfecto con V-ing
mustn't I have been liaising? mustn't you have been liaising? mustn't he have been liaising? mustn't we have been liaising? mustn't you have been liaising? mustn't they have been liaising?