English verb conjugation
MAY PLUMB

Regular verb: plumb - plumbed - plumbed

Affirmation

Simple form	V-ing form
I may plumb you may plumb he may plumb we may plumb you may plumb they may plumb	I may be plumbing you may be plumbing he may be plumbing we may be plumbing you may be plumbing they may be plumbing
Perfect	V-ing perfect
I may have plumbed you may have plumbed he may have plumbed we may have plumbed you may have plumbed they may have plumbed	I may have been plumbing you may have been plumbing he may have been plumbing we may have been plumbing you may have been plumbing they may have been plumbing

Negation

Simple form	V-ing form
I mayn't plumb you mayn't plumb he mayn't plumb we mayn't plumb you mayn't plumb they mayn't plumb	I mayn't be plumbing you mayn't be plumbing he mayn't be plumbing we mayn't be plumbing you mayn't be plumbing they mayn't be plumbing
Perfect	V-ing perfect
I mayn't have plumbed you mayn't have plumbed he mayn't have plumbed we mayn't have plumbed you mayn't have plumbed they mayn't have plumbed	I mayn't have been plumbing you mayn't have been plumbing he mayn't have been plumbing we mayn't have been plumbing you mayn't have been plumbing they mayn't have been plumbing

Interrogative form

Simple form	V-ing form
may I plumb? may you plumb? may he plumb? may we plumb? may you plumb? may they plumb?	may I be plumbing? may you be plumbing? may he be plumbing? may we be plumbing? may you be plumbing? may they be plumbing?
Perfect	V-ing perfect
may I have plumbed? may you have plumbed? may he have plumbed? may we have plumbed? may you have plumbed? may they have plumbed?	may I have been plumbing? may you have been plumbing? may he have been plumbing? may we have been plumbing? may you have been plumbing? may they have been plumbing?

Interro-negative form

Simple form	V-ing form
mayn't I plumb? mayn't you plumb? mayn't he plumb? mayn't we plumb? mayn't you plumb? mayn't they plumb?	mayn't I be plumbing? mayn't you be plumbing? mayn't he be plumbing? mayn't we be plumbing? mayn't you be plumbing? mayn't they be plumbing?
Perfect	V-ing perfect
mayn't I have plumbed? mayn't you have plumbed? mayn't he have plumbed? mayn't we have plumbed? mayn't you have plumbed? mayn't they have plumbed?	mayn't I have been plumbing? mayn't you have been plumbing? mayn't he have been plumbing? mayn't we have been plumbing? mayn't you have been plumbing? mayn't they have been plumbing?