must parboil
Verbo regular: parboil - parboiled- parboiled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must parboil
you must parboil
he must parboil
we must parboil
you must parboil
they must parboil 	I must be parboiling
you must be parboiling
he must be parboiling
we must be parboiling
you must be parboiling
they must be parboiling	I must have parboiled
you must have parboiled
he must have parboiled
we must have parboiled
you must have parboiled
they must have parboiled	I must have been parboiling
you must have been parboiling
he must have been parboiling
we must have been parboiling
you must have been parboiling
they must have been parboiling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not parboil
you must not parboil
he must not parboil
we must not parboil
you must not parboil
they must not parboil 	I must not be parboiling
you must not be parboiling
he must not be parboiling
we must not be parboiling
you must not be parboiling
they must not be parboiling	I must not have parboiled
you must not have parboiled
he must not have parboiled
we must not have parboiled
you must not have parboiled
they must not have parboiled	I must not have been parboiling
you must not have been parboiling
he must not have been parboiling
we must not have been parboiling
you must not have been parboiling
they must not have been parboiling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I parboil?
must you parboil?
must he parboil?
must we parboil?
must you parboil?
must they parboil? 	must I be parboiling?
must you be parboiling?
must he be parboiling?
must we be parboiling?
must you be parboiling?
must they be parboiling? 	must I have parboiled?
must you have parboiled?
must he have parboiled?
must we have parboiled?
must you have parboiled?
must they have parboiled? 	must I have been parboiling?
must you have been parboiling?
must he have been parboiling?
must we have been parboiling?
must you have been parboiling?
must they have been parboiling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not parboil?
must you not parboil?
must he not parboil?
must we not parboil?
must you not parboil?
must they not parboil? 	must I not be parboiling?
must you not be parboiling?
must he not be parboiling?
must we not be parboiling?
must you not be parboiling?
must they not be parboiling? 	must I not have parboiled?
must you not have parboiled?
must he not have parboiled?
must we not have parboiled?
must you not have parboiled?
must they not have parboiled? 	must I not have been parboiling?
must you not have been parboiling?
must he not have been parboiling?
must we not have been parboiling?
must you not have been parboiling?
must they not have been parboiling?