I may litter you may litter she may litter we may litter you may litter they may litter
V-ing form
I may be littering you may be littering she may be littering we may be littering you may be littering they may be littering
Perfect
I may have littered you may have littered she 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 she 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 she 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 she 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 she 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 she 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 she litter? may we litter? may you litter? may they litter?
V-ing form
may I be littering? may you be littering? may she be littering? may we be littering? may you be littering? may they be littering?
Perfect
may I have littered? may you have littered? may she 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 she 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 she 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 she 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 she 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 she not have been littering? may we not have been littering? may you not have been littering? may they not have been littering?