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