may screw
Regular verb: screw - screwed- screwed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may screw
you may screw
she may screw
we may screw
you may screw
they may screw 	I may be screwing
you may be screwing
she may be screwing
we may be screwing
you may be screwing
they may be screwing	I may have screwed
you may have screwed
she may have screwed
we may have screwed
you may have screwed
they may have screwed	I may have been screwing
you may have been screwing
she may have been screwing
we may have been screwing
you may have been screwing
they may have been screwing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't screw
you mayn't screw
she mayn't screw
we mayn't screw
you mayn't screw
they mayn't screw 	I mayn't be screwing
you mayn't be screwing
she mayn't be screwing
we mayn't be screwing
you mayn't be screwing
they mayn't be screwing	I mayn't have screwed
you mayn't have screwed
she mayn't have screwed
we mayn't have screwed
you mayn't have screwed
they mayn't have screwed	I mayn't have been screwing
you mayn't have been screwing
she mayn't have been screwing
we mayn't have been screwing
you mayn't have been screwing
they mayn't have been screwing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I screw?
may you screw?
may she screw?
may we screw?
may you screw?
may they screw? 	may I be screwing?
may you be screwing?
may she be screwing?
may we be screwing?
may you be screwing?
may they be screwing? 	may I have screwed?
may you have screwed?
may she have screwed?
may we have screwed?
may you have screwed?
may they have screwed? 	may I have been screwing?
may you have been screwing?
may she have been screwing?
may we have been screwing?
may you have been screwing?
may they have been screwing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I screw?
mayn't you screw?
mayn't she screw?
mayn't we screw?
mayn't you screw?
mayn't they screw? 	mayn't I be screwing?
mayn't you be screwing?
mayn't she be screwing?
mayn't we be screwing?
mayn't you be screwing?
mayn't they be screwing? 	mayn't I have screwed?
mayn't you have screwed?
mayn't she have screwed?
mayn't we have screwed?
mayn't you have screwed?
mayn't they have screwed? 	mayn't I have been screwing?
mayn't you have been screwing?
mayn't she have been screwing?
mayn't we have been screwing?
mayn't you have been screwing?
mayn't they have been screwing?