must precheck
Verbe régulier : precheck - prechecked- prechecked

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must precheck
you must precheck
she must precheck
we must precheck
you must precheck
they must precheck 	I must be prechecking
you must be prechecking
she must be prechecking
we must be prechecking
you must be prechecking
they must be prechecking	I must have prechecked
you must have prechecked
she must have prechecked
we must have prechecked
you must have prechecked
they must have prechecked	I must have been prechecking
you must have been prechecking
she must have been prechecking
we must have been prechecking
you must have been prechecking
they must have been prechecking	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't precheck
you mustn't precheck
she mustn't precheck
we mustn't precheck
you mustn't precheck
they mustn't precheck 	I mustn't be prechecking
you mustn't be prechecking
she mustn't be prechecking
we mustn't be prechecking
you mustn't be prechecking
they mustn't be prechecking	I mustn't have prechecked
you mustn't have prechecked
she mustn't have prechecked
we mustn't have prechecked
you mustn't have prechecked
they mustn't have prechecked	I mustn't have been prechecking
you mustn't have been prechecking
she mustn't have been prechecking
we mustn't have been prechecking
you mustn't have been prechecking
they mustn't have been prechecking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I precheck?
must you precheck?
must she precheck?
must we precheck?
must you precheck?
must they precheck? 	must I be prechecking?
must you be prechecking?
must she be prechecking?
must we be prechecking?
must you be prechecking?
must they be prechecking? 	must I have prechecked?
must you have prechecked?
must she have prechecked?
must we have prechecked?
must you have prechecked?
must they have prechecked? 	must I have been prechecking?
must you have been prechecking?
must she have been prechecking?
must we have been prechecking?
must you have been prechecking?
must they have been prechecking? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I precheck?
mustn't you precheck?
mustn't she precheck?
mustn't we precheck?
mustn't you precheck?
mustn't they precheck? 	mustn't I be prechecking?
mustn't you be prechecking?
mustn't she be prechecking?
mustn't we be prechecking?
mustn't you be prechecking?
mustn't they be prechecking? 	mustn't I have prechecked?
mustn't you have prechecked?
mustn't she have prechecked?
mustn't we have prechecked?
mustn't you have prechecked?
mustn't they have prechecked? 	mustn't I have been prechecking?
mustn't you have been prechecking?
mustn't she have been prechecking?
mustn't we have been prechecking?
mustn't you have been prechecking?
mustn't they have been prechecking?