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 may not preheat you may not preheat he may not preheat we may not preheat you may not preheat they may not preheat	I may not be preheating you may not be preheating he may not be preheating we may not be preheating you may not be preheating they may not be preheating
Perfect	V-ing perfect
I may not have preheated you may not have preheated he may not have preheated we may not have preheated you may not have preheated they may not have preheated	I may not have been preheating you may not have been preheating he may not have been preheating we may not have been preheating you may not have been preheating they may not 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
may I not preheat? may you not preheat? may he not preheat? may we not preheat? may you not preheat? may they not preheat?	may I not be preheating? may you not be preheating? may he not be preheating? may we not be preheating? may you not be preheating? may they not be preheating?
Perfect	V-ing perfect
may I not have preheated? may you not have preheated? may he not have preheated? may we not have preheated? may you not have preheated? may they not have preheated?	may I not have been preheating? may you not have been preheating? may he not have been preheating? may we not have been preheating? may you not have been preheating? may they not have been preheating?