English verb conjugation
MUST HEAT

Regular verb: heat - heated - heated

Affirmation

Simple form	V-ing form
I must heat you must heat she must heat we must heat you must heat they must heat	I must be heating you must be heating she must be heating we must be heating you must be heating they must be heating
Perfect	V-ing perfect
I must have heated you must have heated she must have heated we must have heated you must have heated they must have heated	I must have been heating you must have been heating she must have been heating we must have been heating you must have been heating they must have been heating

Negation

Simple form	V-ing form
I mustn't heat you mustn't heat she mustn't heat we mustn't heat you mustn't heat they mustn't heat	I mustn't be heating you mustn't be heating she mustn't be heating we mustn't be heating you mustn't be heating they mustn't be heating
Perfect	V-ing perfect
I mustn't have heated you mustn't have heated she mustn't have heated we mustn't have heated you mustn't have heated they mustn't have heated	I mustn't have been heating you mustn't have been heating she mustn't have been heating we mustn't have been heating you mustn't have been heating they mustn't have been heating

Interrogative form

Simple form	V-ing form
must I heat? must you heat? must she heat? must we heat? must you heat? must they heat?	must I be heating? must you be heating? must she be heating? must we be heating? must you be heating? must they be heating?
Perfect	V-ing perfect
must I have heated? must you have heated? must she have heated? must we have heated? must you have heated? must they have heated?	must I have been heating? must you have been heating? must she have been heating? must we have been heating? must you have been heating? must they have been heating?

Interro-negative form

Simple form	V-ing form
mustn't I heat? mustn't you heat? mustn't she heat? mustn't we heat? mustn't you heat? mustn't they heat?	mustn't I be heating? mustn't you be heating? mustn't she be heating? mustn't we be heating? mustn't you be heating? mustn't they be heating?
Perfect	V-ing perfect
mustn't I have heated? mustn't you have heated? mustn't she have heated? mustn't we have heated? mustn't you have heated? mustn't they have heated?	mustn't I have been heating? mustn't you have been heating? mustn't she have been heating? mustn't we have been heating? mustn't you have been heating? mustn't they have been heating?