may cross-check
Regular verb: cross-check - cross-checked- cross-checked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may cross-check
you may cross-check
she may cross-check
we may cross-check
you may cross-check
they may cross-check 	I may be cross-checking
you may be cross-checking
she may be cross-checking
we may be cross-checking
you may be cross-checking
they may be cross-checking	I may have cross-checked
you may have cross-checked
she may have cross-checked
we may have cross-checked
you may have cross-checked
they may have cross-checked	I may have been cross-checking
you may have been cross-checking
she may have been cross-checking
we may have been cross-checking
you may have been cross-checking
they may have been cross-checking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't cross-check
you mayn't cross-check
she mayn't cross-check
we mayn't cross-check
you mayn't cross-check
they mayn't cross-check 	I mayn't be cross-checking
you mayn't be cross-checking
she mayn't be cross-checking
we mayn't be cross-checking
you mayn't be cross-checking
they mayn't be cross-checking	I mayn't have cross-checked
you mayn't have cross-checked
she mayn't have cross-checked
we mayn't have cross-checked
you mayn't have cross-checked
they mayn't have cross-checked	I mayn't have been cross-checking
you mayn't have been cross-checking
she mayn't have been cross-checking
we mayn't have been cross-checking
you mayn't have been cross-checking
they mayn't have been cross-checking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I cross-check?
may you cross-check?
may she cross-check?
may we cross-check?
may you cross-check?
may they cross-check? 	may I be cross-checking?
may you be cross-checking?
may she be cross-checking?
may we be cross-checking?
may you be cross-checking?
may they be cross-checking? 	may I have cross-checked?
may you have cross-checked?
may she have cross-checked?
may we have cross-checked?
may you have cross-checked?
may they have cross-checked? 	may I have been cross-checking?
may you have been cross-checking?
may she have been cross-checking?
may we have been cross-checking?
may you have been cross-checking?
may they have been cross-checking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I cross-check?
mayn't you cross-check?
mayn't she cross-check?
mayn't we cross-check?
mayn't you cross-check?
mayn't they cross-check? 	mayn't I be cross-checking?
mayn't you be cross-checking?
mayn't she be cross-checking?
mayn't we be cross-checking?
mayn't you be cross-checking?
mayn't they be cross-checking? 	mayn't I have cross-checked?
mayn't you have cross-checked?
mayn't she have cross-checked?
mayn't we have cross-checked?
mayn't you have cross-checked?
mayn't they have cross-checked? 	mayn't I have been cross-checking?
mayn't you have been cross-checking?
mayn't she have been cross-checking?
mayn't we have been cross-checking?
mayn't you have been cross-checking?
mayn't they have been cross-checking?