may precheck
Regular verb: precheck - prechecked- prechecked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may precheck
you may precheck
she may precheck
we may precheck
you may precheck
they may precheck 	I may be prechecking
you may be prechecking
she may be prechecking
we may be prechecking
you may be prechecking
they may be prechecking	I may have prechecked
you may have prechecked
she may have prechecked
we may have prechecked
you may have prechecked
they may have prechecked	I may have been prechecking
you may have been prechecking
she may have been prechecking
we may have been prechecking
you may have been prechecking
they may have been prechecking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't precheck
you mayn't precheck
she mayn't precheck
we mayn't precheck
you mayn't precheck
they mayn't precheck 	I mayn't be prechecking
you mayn't be prechecking
she mayn't be prechecking
we mayn't be prechecking
you mayn't be prechecking
they mayn't be prechecking	I mayn't have prechecked
you mayn't have prechecked
she mayn't have prechecked
we mayn't have prechecked
you mayn't have prechecked
they mayn't have prechecked	I mayn't have been prechecking
you mayn't have been prechecking
she mayn't have been prechecking
we mayn't have been prechecking
you mayn't have been prechecking
they mayn't have been prechecking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I precheck?
may you precheck?
may she precheck?
may we precheck?
may you precheck?
may they precheck? 	may I be prechecking?
may you be prechecking?
may she be prechecking?
may we be prechecking?
may you be prechecking?
may they be prechecking? 	may I have prechecked?
may you have prechecked?
may she have prechecked?
may we have prechecked?
may you have prechecked?
may they have prechecked? 	may I have been prechecking?
may you have been prechecking?
may she have been prechecking?
may we have been prechecking?
may you have been prechecking?
may they have been prechecking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I precheck?
mayn't you precheck?
mayn't she precheck?
mayn't we precheck?
mayn't you precheck?
mayn't they precheck? 	mayn't I be prechecking?
mayn't you be prechecking?
mayn't she be prechecking?
mayn't we be prechecking?
mayn't you be prechecking?
mayn't they be prechecking? 	mayn't I have prechecked?
mayn't you have prechecked?
mayn't she have prechecked?
mayn't we have prechecked?
mayn't you have prechecked?
mayn't they have prechecked? 	mayn't I have been prechecking?
mayn't you have been prechecking?
mayn't she have been prechecking?
mayn't we have been prechecking?
mayn't you have been prechecking?
mayn't they have been prechecking?