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