English verb conjugation
MAY SUM

Regular verb: sum - summed - summed

Affirmation

Simple form	V-ing form
I may sum you may sum she may sum we may sum you may sum they may sum	I may be summing you may be summing she may be summing we may be summing you may be summing they may be summing
Perfect	V-ing perfect
I may have summed you may have summed she may have summed we may have summed you may have summed they may have summed	I may have been summing you may have been summing she may have been summing we may have been summing you may have been summing they may have been summing

Negation

Simple form	V-ing form
I mayn't sum you mayn't sum she mayn't sum we mayn't sum you mayn't sum they mayn't sum	I mayn't be summing you mayn't be summing she mayn't be summing we mayn't be summing you mayn't be summing they mayn't be summing
Perfect	V-ing perfect
I mayn't have summed you mayn't have summed she mayn't have summed we mayn't have summed you mayn't have summed they mayn't have summed	I mayn't have been summing you mayn't have been summing she mayn't have been summing we mayn't have been summing you mayn't have been summing they mayn't have been summing

Interrogative form

Simple form	V-ing form
may I sum? may you sum? may she sum? may we sum? may you sum? may they sum?	may I be summing? may you be summing? may she be summing? may we be summing? may you be summing? may they be summing?
Perfect	V-ing perfect
may I have summed? may you have summed? may she have summed? may we have summed? may you have summed? may they have summed?	may I have been summing? may you have been summing? may she have been summing? may we have been summing? may you have been summing? may they have been summing?

Interro-negative form

Simple form	V-ing form
mayn't I sum? mayn't you sum? mayn't she sum? mayn't we sum? mayn't you sum? mayn't they sum?	mayn't I be summing? mayn't you be summing? mayn't she be summing? mayn't we be summing? mayn't you be summing? mayn't they be summing?
Perfect	V-ing perfect
mayn't I have summed? mayn't you have summed? mayn't she have summed? mayn't we have summed? mayn't you have summed? mayn't they have summed?	mayn't I have been summing? mayn't you have been summing? mayn't she have been summing? mayn't we have been summing? mayn't you have been summing? mayn't they have been summing?