must sneeze
Regular verb: sneeze - sneezed- sneezed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sneeze
you must sneeze
she must sneeze
we must sneeze
you must sneeze
they must sneeze 	I must be sneezing
you must be sneezing
she must be sneezing
we must be sneezing
you must be sneezing
they must be sneezing	I must have sneezed
you must have sneezed
she must have sneezed
we must have sneezed
you must have sneezed
they must have sneezed	I must have been sneezing
you must have been sneezing
she must have been sneezing
we must have been sneezing
you must have been sneezing
they must have been sneezing	

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

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