I may litter you may litter he may litter we may litter you may litter they may litter
V-ing form
I may be littering you may be littering he may be littering we may be littering you may be littering they may be littering
Perfect
I may have littered you may have littered he may have littered we may have littered you may have littered they may have littered
V-ing perfect
I may have been littering you may have been littering he may have been littering we may have been littering you may have been littering they may have been littering
Negation
Simple form
I may not litter you may not litter he may not litter we may not litter you may not litter they may not litter
V-ing form
I may not be littering you may not be littering he may not be littering we may not be littering you may not be littering they may not be littering
Perfect
I may not have littered you may not have littered he may not have littered we may not have littered you may not have littered they may not have littered
V-ing perfect
I may not have been littering you may not have been littering he may not have been littering we may not have been littering you may not have been littering they may not have been littering
Interrogative form
Simple form
may I litter? may you litter? may he litter? may we litter? may you litter? may they litter?
V-ing form
may I be littering? may you be littering? may he be littering? may we be littering? may you be littering? may they be littering?
Perfect
may I have littered? may you have littered? may he have littered? may we have littered? may you have littered? may they have littered?
V-ing perfect
may I have been littering? may you have been littering? may he have been littering? may we have been littering? may you have been littering? may they have been littering?
Interro-negative form
Simple form
may I not litter? may you not litter? may he not litter? may we not litter? may you not litter? may they not litter?
V-ing form
may I not be littering? may you not be littering? may he not be littering? may we not be littering? may you not be littering? may they not be littering?
Perfect
may I not have littered? may you not have littered? may he not have littered? may we not have littered? may you not have littered? may they not have littered?
V-ing perfect
may I not have been littering? may you not have been littering? may he not have been littering? may we not have been littering? may you not have been littering? may they not have been littering?