must undercool
Verbo regular: undercool - undercooled- undercooled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must undercool
you must undercool
he must undercool
we must undercool
you must undercool
they must undercool 	I must be undercooling
you must be undercooling
he must be undercooling
we must be undercooling
you must be undercooling
they must be undercooling	I must have undercooled
you must have undercooled
he must have undercooled
we must have undercooled
you must have undercooled
they must have undercooled	I must have been undercooling
you must have been undercooling
he must have been undercooling
we must have been undercooling
you must have been undercooling
they must have been undercooling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not undercool
you must not undercool
he must not undercool
we must not undercool
you must not undercool
they must not undercool 	I must not be undercooling
you must not be undercooling
he must not be undercooling
we must not be undercooling
you must not be undercooling
they must not be undercooling	I must not have undercooled
you must not have undercooled
he must not have undercooled
we must not have undercooled
you must not have undercooled
they must not have undercooled	I must not have been undercooling
you must not have been undercooling
he must not have been undercooling
we must not have been undercooling
you must not have been undercooling
they must not have been undercooling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I undercool?
must you undercool?
must he undercool?
must we undercool?
must you undercool?
must they undercool? 	must I be undercooling?
must you be undercooling?
must he be undercooling?
must we be undercooling?
must you be undercooling?
must they be undercooling? 	must I have undercooled?
must you have undercooled?
must he have undercooled?
must we have undercooled?
must you have undercooled?
must they have undercooled? 	must I have been undercooling?
must you have been undercooling?
must he have been undercooling?
must we have been undercooling?
must you have been undercooling?
must they have been undercooling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not undercool?
must you not undercool?
must he not undercool?
must we not undercool?
must you not undercool?
must they not undercool? 	must I not be undercooling?
must you not be undercooling?
must he not be undercooling?
must we not be undercooling?
must you not be undercooling?
must they not be undercooling? 	must I not have undercooled?
must you not have undercooled?
must he not have undercooled?
must we not have undercooled?
must you not have undercooled?
must they not have undercooled? 	must I not have been undercooling?
must you not have been undercooling?
must he not have been undercooling?
must we not have been undercooling?
must you not have been undercooling?
must they not have been undercooling?