English verb conjugation
MUST PREHEAT

Regular verb: preheat - preheated - preheated

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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