may precheck
Regular verb: precheck - prechecked- prechecked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may precheck
you may precheck
he may precheck
we may precheck
you may precheck
they may precheck 	I may be prechecking
you may be prechecking
he may be prechecking
we may be prechecking
you may be prechecking
they may be prechecking	I may have prechecked
you may have prechecked
he 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
he 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 may not precheck
you may not precheck
he may not precheck
we may not precheck
you may not precheck
they may not precheck 	I may not be prechecking
you may not be prechecking
he may not be prechecking
we may not be prechecking
you may not be prechecking
they may not be prechecking	I may not have prechecked
you may not have prechecked
he may not have prechecked
we may not have prechecked
you may not have prechecked
they may not have prechecked	I may not have been prechecking
you may not have been prechecking
he may not have been prechecking
we may not have been prechecking
you may not have been prechecking
they may not have been prechecking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I precheck?
may you precheck?
may he precheck?
may we precheck?
may you precheck?
may they precheck? 	may I be prechecking?
may you be prechecking?
may he be prechecking?
may we be prechecking?
may you be prechecking?
may they be prechecking? 	may I have prechecked?
may you have prechecked?
may he 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 he 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 	
may I not precheck?
may you not precheck?
may he not precheck?
may we not precheck?
may you not precheck?
may they not precheck? 	may I not be prechecking?
may you not be prechecking?
may he not be prechecking?
may we not be prechecking?
may you not be prechecking?
may they not be prechecking? 	may I not have prechecked?
may you not have prechecked?
may he not have prechecked?
may we not have prechecked?
may you not have prechecked?
may they not have prechecked? 	may I not have been prechecking?
may you not have been prechecking?
may he not have been prechecking?
may we not have been prechecking?
may you not have been prechecking?
may they not have been prechecking?