English verb conjugation
MAY HEIGHTEN

Regular verb: heighten - heightened - heightened

Affirmation

Simple form	V-ing form
I may heighten you may heighten he may heighten we may heighten you may heighten they may heighten	I may be heightening you may be heightening he may be heightening we may be heightening you may be heightening they may be heightening
Perfect	V-ing perfect
I may have heightened you may have heightened he may have heightened we may have heightened you may have heightened they may have heightened	I may have been heightening you may have been heightening he may have been heightening we may have been heightening you may have been heightening they may have been heightening

Negation

Simple form	V-ing form
I mayn't heighten you mayn't heighten he mayn't heighten we mayn't heighten you mayn't heighten they mayn't heighten	I mayn't be heightening you mayn't be heightening he mayn't be heightening we mayn't be heightening you mayn't be heightening they mayn't be heightening
Perfect	V-ing perfect
I mayn't have heightened you mayn't have heightened he mayn't have heightened we mayn't have heightened you mayn't have heightened they mayn't have heightened	I mayn't have been heightening you mayn't have been heightening he mayn't have been heightening we mayn't have been heightening you mayn't have been heightening they mayn't have been heightening

Interrogative form

Simple form	V-ing form
may I heighten? may you heighten? may he heighten? may we heighten? may you heighten? may they heighten?	may I be heightening? may you be heightening? may he be heightening? may we be heightening? may you be heightening? may they be heightening?
Perfect	V-ing perfect
may I have heightened? may you have heightened? may he have heightened? may we have heightened? may you have heightened? may they have heightened?	may I have been heightening? may you have been heightening? may he have been heightening? may we have been heightening? may you have been heightening? may they have been heightening?

Interro-negative form

Simple form	V-ing form
mayn't I heighten? mayn't you heighten? mayn't he heighten? mayn't we heighten? mayn't you heighten? mayn't they heighten?	mayn't I be heightening? mayn't you be heightening? mayn't he be heightening? mayn't we be heightening? mayn't you be heightening? mayn't they be heightening?
Perfect	V-ing perfect
mayn't I have heightened? mayn't you have heightened? mayn't he have heightened? mayn't we have heightened? mayn't you have heightened? mayn't they have heightened?	mayn't I have been heightening? mayn't you have been heightening? mayn't he have been heightening? mayn't we have been heightening? mayn't you have been heightening? mayn't they have been heightening?