I must study you must study he must study we must study you must study they must study
Forma com V-ing
I must be studying you must be studying he must be studying we must be studying you must be studying they must be studying
Perfeito
I must have studied you must have studied he must have studied we must have studied you must have studied they must have studied
Perfeito com V-ing
I must have been studying you must have been studying he must have been studying we must have been studying you must have been studying they must have been studying
Negação
Forma simple
I mustn't study you mustn't study he mustn't study we mustn't study you mustn't study they mustn't study
Forma com V-ing
I mustn't be studying you mustn't be studying he mustn't be studying we mustn't be studying you mustn't be studying they mustn't be studying
Perfeito
I mustn't have studied you mustn't have studied he mustn't have studied we mustn't have studied you mustn't have studied they mustn't have studied
Perfeito com V-ing
I mustn't have been studying you mustn't have been studying he mustn't have been studying we mustn't have been studying you mustn't have been studying they mustn't have been studying
Forma interrogativa
Forma simple
must I study? must you study? must he study? must we study? must you study? must they study?
Forma com V-ing
must I be studying? must you be studying? must he be studying? must we be studying? must you be studying? must they be studying?
Perfeito
must I have studied? must you have studied? must he have studied? must we have studied? must you have studied? must they have studied?
Perfeito com V-ing
must I have been studying? must you have been studying? must he have been studying? must we have been studying? must you have been studying? must they have been studying?
Forma interro-Negação
Forma simple
mustn't I study? mustn't you study? mustn't he study? mustn't we study? mustn't you study? mustn't they study?
Forma com V-ing
mustn't I be studying? mustn't you be studying? mustn't he be studying? mustn't we be studying? mustn't you be studying? mustn't they be studying?
Perfeito
mustn't I have studied? mustn't you have studied? mustn't he have studied? mustn't we have studied? mustn't you have studied? mustn't they have studied?
Perfeito com V-ing
mustn't I have been studying? mustn't you have been studying? mustn't he have been studying? mustn't we have been studying? mustn't you have been studying? mustn't they have been studying?