English verb conjugation
MAY PREHEAT

Regular verb: preheat - preheated - preheated

Affirmation

Simple form	V-ing form
I may preheat you may preheat he may preheat we may preheat you may preheat they may preheat	I may be preheating you may be preheating he may be preheating we may be preheating you may be preheating they may be preheating
Perfect	V-ing perfect
I may have preheated you may have preheated he may have preheated we may have preheated you may have preheated they may have preheated	I may have been preheating you may have been preheating he may have been preheating we may have been preheating you may have been preheating they may have been preheating

Negation

Simple form	V-ing form
I mayn't preheat you mayn't preheat he mayn't preheat we mayn't preheat you mayn't preheat they mayn't preheat	I mayn't be preheating you mayn't be preheating he mayn't be preheating we mayn't be preheating you mayn't be preheating they mayn't be preheating
Perfect	V-ing perfect
I mayn't have preheated you mayn't have preheated he mayn't have preheated we mayn't have preheated you mayn't have preheated they mayn't have preheated	I mayn't have been preheating you mayn't have been preheating he mayn't have been preheating we mayn't have been preheating you mayn't have been preheating they mayn't have been preheating

Interrogative form

Simple form	V-ing form
may I preheat? may you preheat? may he preheat? may we preheat? may you preheat? may they preheat?	may I be preheating? may you be preheating? may he be preheating? may we be preheating? may you be preheating? may they be preheating?
Perfect	V-ing perfect
may I have preheated? may you have preheated? may he have preheated? may we have preheated? may you have preheated? may they have preheated?	may I have been preheating? may you have been preheating? may he have been preheating? may we have been preheating? may you have been preheating? may they have been preheating?

Interro-negative form

Simple form	V-ing form
mayn't I preheat? mayn't you preheat? mayn't he preheat? mayn't we preheat? mayn't you preheat? mayn't they preheat?	mayn't I be preheating? mayn't you be preheating? mayn't he be preheating? mayn't we be preheating? mayn't you be preheating? mayn't they be preheating?
Perfect	V-ing perfect
mayn't I have preheated? mayn't you have preheated? mayn't he have preheated? mayn't we have preheated? mayn't you have preheated? mayn't they have preheated?	mayn't I have been preheating? mayn't you have been preheating? mayn't he have been preheating? mayn't we have been preheating? mayn't you have been preheating? mayn't they have been preheating?