may thread
Regular verb: thread - threaded- threaded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may thread
you may thread
she may thread
we may thread
you may thread
they may thread 	I may be threading
you may be threading
she may be threading
we may be threading
you may be threading
they may be threading	I may have threaded
you may have threaded
she may have threaded
we may have threaded
you may have threaded
they may have threaded	I may have been threading
you may have been threading
she may have been threading
we may have been threading
you may have been threading
they may have been threading	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't thread
you mayn't thread
she mayn't thread
we mayn't thread
you mayn't thread
they mayn't thread 	I mayn't be threading
you mayn't be threading
she mayn't be threading
we mayn't be threading
you mayn't be threading
they mayn't be threading	I mayn't have threaded
you mayn't have threaded
she mayn't have threaded
we mayn't have threaded
you mayn't have threaded
they mayn't have threaded	I mayn't have been threading
you mayn't have been threading
she mayn't have been threading
we mayn't have been threading
you mayn't have been threading
they mayn't have been threading	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I thread?
may you thread?
may she thread?
may we thread?
may you thread?
may they thread? 	may I be threading?
may you be threading?
may she be threading?
may we be threading?
may you be threading?
may they be threading? 	may I have threaded?
may you have threaded?
may she have threaded?
may we have threaded?
may you have threaded?
may they have threaded? 	may I have been threading?
may you have been threading?
may she have been threading?
may we have been threading?
may you have been threading?
may they have been threading? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I thread?
mayn't you thread?
mayn't she thread?
mayn't we thread?
mayn't you thread?
mayn't they thread? 	mayn't I be threading?
mayn't you be threading?
mayn't she be threading?
mayn't we be threading?
mayn't you be threading?
mayn't they be threading? 	mayn't I have threaded?
mayn't you have threaded?
mayn't she have threaded?
mayn't we have threaded?
mayn't you have threaded?
mayn't they have threaded? 	mayn't I have been threading?
mayn't you have been threading?
mayn't she have been threading?
mayn't we have been threading?
mayn't you have been threading?
mayn't they have been threading?