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