I may gibber you may gibber he may gibber we may gibber you may gibber they may gibber
V-ing form
I may be gibbering you may be gibbering he may be gibbering we may be gibbering you may be gibbering they may be gibbering
Perfect
I may have gibbered you may have gibbered he may have gibbered we may have gibbered you may have gibbered they may have gibbered
V-ing perfect
I may have been gibbering you may have been gibbering he may have been gibbering we may have been gibbering you may have been gibbering they may have been gibbering
Negation
Simple form
I mayn't gibber you mayn't gibber he mayn't gibber we mayn't gibber you mayn't gibber they mayn't gibber
V-ing form
I mayn't be gibbering you mayn't be gibbering he mayn't be gibbering we mayn't be gibbering you mayn't be gibbering they mayn't be gibbering
Perfect
I mayn't have gibbered you mayn't have gibbered he mayn't have gibbered we mayn't have gibbered you mayn't have gibbered they mayn't have gibbered
V-ing perfect
I mayn't have been gibbering you mayn't have been gibbering he mayn't have been gibbering we mayn't have been gibbering you mayn't have been gibbering they mayn't have been gibbering
Interrogative form
Simple form
may I gibber? may you gibber? may he gibber? may we gibber? may you gibber? may they gibber?
V-ing form
may I be gibbering? may you be gibbering? may he be gibbering? may we be gibbering? may you be gibbering? may they be gibbering?
Perfect
may I have gibbered? may you have gibbered? may he have gibbered? may we have gibbered? may you have gibbered? may they have gibbered?
V-ing perfect
may I have been gibbering? may you have been gibbering? may he have been gibbering? may we have been gibbering? may you have been gibbering? may they have been gibbering?
Interro-negative form
Simple form
mayn't I gibber? mayn't you gibber? mayn't he gibber? mayn't we gibber? mayn't you gibber? mayn't they gibber?
V-ing form
mayn't I be gibbering? mayn't you be gibbering? mayn't he be gibbering? mayn't we be gibbering? mayn't you be gibbering? mayn't they be gibbering?
Perfect
mayn't I have gibbered? mayn't you have gibbered? mayn't he have gibbered? mayn't we have gibbered? mayn't you have gibbered? mayn't they have gibbered?
V-ing perfect
mayn't I have been gibbering? mayn't you have been gibbering? mayn't he have been gibbering? mayn't we have been gibbering? mayn't you have been gibbering? mayn't they have been gibbering?