English verb conjugation
MAY SUSTAIN

Regular verb: sustain - sustained - sustained

Affirmation

Simple form	V-ing form
I may sustain you may sustain she may sustain we may sustain you may sustain they may sustain	I may be sustaining you may be sustaining she may be sustaining we may be sustaining you may be sustaining they may be sustaining
Perfect	V-ing perfect
I may have sustained you may have sustained she may have sustained we may have sustained you may have sustained they may have sustained	I may have been sustaining you may have been sustaining she may have been sustaining we may have been sustaining you may have been sustaining they may have been sustaining

Negation

Simple form	V-ing form
I mayn't sustain you mayn't sustain she mayn't sustain we mayn't sustain you mayn't sustain they mayn't sustain	I mayn't be sustaining you mayn't be sustaining she mayn't be sustaining we mayn't be sustaining you mayn't be sustaining they mayn't be sustaining
Perfect	V-ing perfect
I mayn't have sustained you mayn't have sustained she mayn't have sustained we mayn't have sustained you mayn't have sustained they mayn't have sustained	I mayn't have been sustaining you mayn't have been sustaining she mayn't have been sustaining we mayn't have been sustaining you mayn't have been sustaining they mayn't have been sustaining

Interrogative form

Simple form	V-ing form
may I sustain? may you sustain? may she sustain? may we sustain? may you sustain? may they sustain?	may I be sustaining? may you be sustaining? may she be sustaining? may we be sustaining? may you be sustaining? may they be sustaining?
Perfect	V-ing perfect
may I have sustained? may you have sustained? may she have sustained? may we have sustained? may you have sustained? may they have sustained?	may I have been sustaining? may you have been sustaining? may she have been sustaining? may we have been sustaining? may you have been sustaining? may they have been sustaining?

Interro-negative form

Simple form	V-ing form
mayn't I sustain? mayn't you sustain? mayn't she sustain? mayn't we sustain? mayn't you sustain? mayn't they sustain?	mayn't I be sustaining? mayn't you be sustaining? mayn't she be sustaining? mayn't we be sustaining? mayn't you be sustaining? mayn't they be sustaining?
Perfect	V-ing perfect
mayn't I have sustained? mayn't you have sustained? mayn't she have sustained? mayn't we have sustained? mayn't you have sustained? mayn't they have sustained?	mayn't I have been sustaining? mayn't you have been sustaining? mayn't she have been sustaining? mayn't we have been sustaining? mayn't you have been sustaining? mayn't they have been sustaining?