I may weld you may weld she may weld we may weld you may weld they may weld
V-ing form
I may be welding you may be welding she may be welding we may be welding you may be welding they may be welding
Perfect
I may have welded you may have welded she may have welded we may have welded you may have welded they may have welded
V-ing perfect
I may have been welding you may have been welding she may have been welding we may have been welding you may have been welding they may have been welding
Negation
Simple form
I mayn't weld you mayn't weld she mayn't weld we mayn't weld you mayn't weld they mayn't weld
V-ing form
I mayn't be welding you mayn't be welding she mayn't be welding we mayn't be welding you mayn't be welding they mayn't be welding
Perfect
I mayn't have welded you mayn't have welded she mayn't have welded we mayn't have welded you mayn't have welded they mayn't have welded
V-ing perfect
I mayn't have been welding you mayn't have been welding she mayn't have been welding we mayn't have been welding you mayn't have been welding they mayn't have been welding
Interrogative form
Simple form
may I weld? may you weld? may she weld? may we weld? may you weld? may they weld?
V-ing form
may I be welding? may you be welding? may she be welding? may we be welding? may you be welding? may they be welding?
Perfect
may I have welded? may you have welded? may she have welded? may we have welded? may you have welded? may they have welded?
V-ing perfect
may I have been welding? may you have been welding? may she have been welding? may we have been welding? may you have been welding? may they have been welding?
Interro-negative form
Simple form
mayn't I weld? mayn't you weld? mayn't she weld? mayn't we weld? mayn't you weld? mayn't they weld?
V-ing form
mayn't I be welding? mayn't you be welding? mayn't she be welding? mayn't we be welding? mayn't you be welding? mayn't they be welding?
Perfect
mayn't I have welded? mayn't you have welded? mayn't she have welded? mayn't we have welded? mayn't you have welded? mayn't they have welded?
V-ing perfect
mayn't I have been welding? mayn't you have been welding? mayn't she have been welding? mayn't we have been welding? mayn't you have been welding? mayn't they have been welding?