must heat
Verbo regular: heat - heated- heated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must heat
you must heat
he must heat
we must heat
you must heat
they must heat 	I must be heating
you must be heating
he must be heating
we must be heating
you must be heating
they must be heating	I must have heated
you must have heated
he 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
he must have been heating
we must have been heating
you must have been heating
they must have been heating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't heat
you mustn't heat
he 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
he mustn't be heating
we mustn't be heating
you mustn't be heating
they mustn't be heating	I mustn't have heated
you mustn't have heated
he 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
he mustn't have been heating
we mustn't have been heating
you mustn't have been heating
they mustn't have been heating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I heat?
must you heat?
must he heat?
must we heat?
must you heat?
must they heat? 	must I be heating?
must you be heating?
must he be heating?
must we be heating?
must you be heating?
must they be heating? 	must I have heated?
must you have heated?
must he 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 he have been heating?
must we have been heating?
must you have been heating?
must they have been heating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I heat?
mustn't you heat?
mustn't he 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 he be heating?
mustn't we be heating?
mustn't you be heating?
mustn't they be heating? 	mustn't I have heated?
mustn't you have heated?
mustn't he 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 he have been heating?
mustn't we have been heating?
mustn't you have been heating?
mustn't they have been heating?