I must suffer you must suffer he must suffer we must suffer you must suffer they must suffer
V-ing form
I must be suffering you must be suffering he must be suffering we must be suffering you must be suffering they must be suffering
Perfect
I must have suffered you must have suffered he must have suffered we must have suffered you must have suffered they must have suffered
V-ing perfect
I must have been suffering you must have been suffering he must have been suffering we must have been suffering you must have been suffering they must have been suffering
Negation
Simple form
I mustn't suffer you mustn't suffer he mustn't suffer we mustn't suffer you mustn't suffer they mustn't suffer
V-ing form
I mustn't be suffering you mustn't be suffering he mustn't be suffering we mustn't be suffering you mustn't be suffering they mustn't be suffering
Perfect
I mustn't have suffered you mustn't have suffered he mustn't have suffered we mustn't have suffered you mustn't have suffered they mustn't have suffered
V-ing perfect
I mustn't have been suffering you mustn't have been suffering he mustn't have been suffering we mustn't have been suffering you mustn't have been suffering they mustn't have been suffering
Interrogative form
Simple form
must I suffer? must you suffer? must he suffer? must we suffer? must you suffer? must they suffer?
V-ing form
must I be suffering? must you be suffering? must he be suffering? must we be suffering? must you be suffering? must they be suffering?
Perfect
must I have suffered? must you have suffered? must he have suffered? must we have suffered? must you have suffered? must they have suffered?
V-ing perfect
must I have been suffering? must you have been suffering? must he have been suffering? must we have been suffering? must you have been suffering? must they have been suffering?
Interro-negative form
Simple form
mustn't I suffer? mustn't you suffer? mustn't he suffer? mustn't we suffer? mustn't you suffer? mustn't they suffer?
V-ing form
mustn't I be suffering? mustn't you be suffering? mustn't he be suffering? mustn't we be suffering? mustn't you be suffering? mustn't they be suffering?
Perfect
mustn't I have suffered? mustn't you have suffered? mustn't he have suffered? mustn't we have suffered? mustn't you have suffered? mustn't they have suffered?
V-ing perfect
mustn't I have been suffering? mustn't you have been suffering? mustn't he have been suffering? mustn't we have been suffering? mustn't you have been suffering? mustn't they have been suffering?