may thread
Regular verb: thread - threaded- threaded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may thread
you may thread
he may thread
we may thread
you may thread
they may thread 	I may be threading
you may be threading
he may be threading
we may be threading
you may be threading
they may be threading	I may have threaded
you may have threaded
he 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
he 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
he 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
he 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
he 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
he 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 he thread?
may we thread?
may you thread?
may they thread? 	may I be threading?
may you be threading?
may he be threading?
may we be threading?
may you be threading?
may they be threading? 	may I have threaded?
may you have threaded?
may he 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 he 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 he 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 he 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 he 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 he have been threading?
mayn't we have been threading?
mayn't you have been threading?
mayn't they have been threading?