English verb conjugation
MAY RUB

Regular verb: rub - rubbed - rubbed

Affirmation

Simple form	V-ing form
I may rub you may rub he may rub we may rub you may rub they may rub	I may be rubbing you may be rubbing he may be rubbing we may be rubbing you may be rubbing they may be rubbing
Perfect	V-ing perfect
I may have rubbed you may have rubbed he may have rubbed we may have rubbed you may have rubbed they may have rubbed	I may have been rubbing you may have been rubbing he may have been rubbing we may have been rubbing you may have been rubbing they may have been rubbing

Negation

Simple form	V-ing form
I mayn't rub you mayn't rub he mayn't rub we mayn't rub you mayn't rub they mayn't rub	I mayn't be rubbing you mayn't be rubbing he mayn't be rubbing we mayn't be rubbing you mayn't be rubbing they mayn't be rubbing
Perfect	V-ing perfect
I mayn't have rubbed you mayn't have rubbed he mayn't have rubbed we mayn't have rubbed you mayn't have rubbed they mayn't have rubbed	I mayn't have been rubbing you mayn't have been rubbing he mayn't have been rubbing we mayn't have been rubbing you mayn't have been rubbing they mayn't have been rubbing

Interrogative form

Simple form	V-ing form
may I rub? may you rub? may he rub? may we rub? may you rub? may they rub?	may I be rubbing? may you be rubbing? may he be rubbing? may we be rubbing? may you be rubbing? may they be rubbing?
Perfect	V-ing perfect
may I have rubbed? may you have rubbed? may he have rubbed? may we have rubbed? may you have rubbed? may they have rubbed?	may I have been rubbing? may you have been rubbing? may he have been rubbing? may we have been rubbing? may you have been rubbing? may they have been rubbing?

Interro-negative form

Simple form	V-ing form
mayn't I rub? mayn't you rub? mayn't he rub? mayn't we rub? mayn't you rub? mayn't they rub?	mayn't I be rubbing? mayn't you be rubbing? mayn't he be rubbing? mayn't we be rubbing? mayn't you be rubbing? mayn't they be rubbing?
Perfect	V-ing perfect
mayn't I have rubbed? mayn't you have rubbed? mayn't he have rubbed? mayn't we have rubbed? mayn't you have rubbed? mayn't they have rubbed?	mayn't I have been rubbing? mayn't you have been rubbing? mayn't he have been rubbing? mayn't we have been rubbing? mayn't you have been rubbing? mayn't they have been rubbing?