may countercheck
Regular verb: countercheck - counterchecked- counterchecked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may countercheck
you may countercheck
he may countercheck
we may countercheck
you may countercheck
they may countercheck 	I may be counterchecking
you may be counterchecking
he may be counterchecking
we may be counterchecking
you may be counterchecking
they may be counterchecking	I may have counterchecked
you may have counterchecked
he may have counterchecked
we may have counterchecked
you may have counterchecked
they may have counterchecked	I may have been counterchecking
you may have been counterchecking
he may have been counterchecking
we may have been counterchecking
you may have been counterchecking
they may have been counterchecking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't countercheck
you mayn't countercheck
he mayn't countercheck
we mayn't countercheck
you mayn't countercheck
they mayn't countercheck 	I mayn't be counterchecking
you mayn't be counterchecking
he mayn't be counterchecking
we mayn't be counterchecking
you mayn't be counterchecking
they mayn't be counterchecking	I mayn't have counterchecked
you mayn't have counterchecked
he mayn't have counterchecked
we mayn't have counterchecked
you mayn't have counterchecked
they mayn't have counterchecked	I mayn't have been counterchecking
you mayn't have been counterchecking
he mayn't have been counterchecking
we mayn't have been counterchecking
you mayn't have been counterchecking
they mayn't have been counterchecking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I countercheck?
may you countercheck?
may he countercheck?
may we countercheck?
may you countercheck?
may they countercheck? 	may I be counterchecking?
may you be counterchecking?
may he be counterchecking?
may we be counterchecking?
may you be counterchecking?
may they be counterchecking? 	may I have counterchecked?
may you have counterchecked?
may he have counterchecked?
may we have counterchecked?
may you have counterchecked?
may they have counterchecked? 	may I have been counterchecking?
may you have been counterchecking?
may he have been counterchecking?
may we have been counterchecking?
may you have been counterchecking?
may they have been counterchecking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I countercheck?
mayn't you countercheck?
mayn't he countercheck?
mayn't we countercheck?
mayn't you countercheck?
mayn't they countercheck? 	mayn't I be counterchecking?
mayn't you be counterchecking?
mayn't he be counterchecking?
mayn't we be counterchecking?
mayn't you be counterchecking?
mayn't they be counterchecking? 	mayn't I have counterchecked?
mayn't you have counterchecked?
mayn't he have counterchecked?
mayn't we have counterchecked?
mayn't you have counterchecked?
mayn't they have counterchecked? 	mayn't I have been counterchecking?
mayn't you have been counterchecking?
mayn't he have been counterchecking?
mayn't we have been counterchecking?
mayn't you have been counterchecking?
mayn't they have been counterchecking?