must undercook
Regular verb: undercook - undercooked- undercooked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must undercook
you must undercook
he must undercook
we must undercook
you must undercook
they must undercook 	I must be undercooking
you must be undercooking
he must be undercooking
we must be undercooking
you must be undercooking
they must be undercooking	I must have undercooked
you must have undercooked
he must have undercooked
we must have undercooked
you must have undercooked
they must have undercooked	I must have been undercooking
you must have been undercooking
he must have been undercooking
we must have been undercooking
you must have been undercooking
they must have been undercooking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not undercook
you must not undercook
he must not undercook
we must not undercook
you must not undercook
they must not undercook 	I must not be undercooking
you must not be undercooking
he must not be undercooking
we must not be undercooking
you must not be undercooking
they must not be undercooking	I must not have undercooked
you must not have undercooked
he must not have undercooked
we must not have undercooked
you must not have undercooked
they must not have undercooked	I must not have been undercooking
you must not have been undercooking
he must not have been undercooking
we must not have been undercooking
you must not have been undercooking
they must not have been undercooking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I undercook?
must you undercook?
must he undercook?
must we undercook?
must you undercook?
must they undercook? 	must I be undercooking?
must you be undercooking?
must he be undercooking?
must we be undercooking?
must you be undercooking?
must they be undercooking? 	must I have undercooked?
must you have undercooked?
must he have undercooked?
must we have undercooked?
must you have undercooked?
must they have undercooked? 	must I have been undercooking?
must you have been undercooking?
must he have been undercooking?
must we have been undercooking?
must you have been undercooking?
must they have been undercooking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not undercook?
must you not undercook?
must he not undercook?
must we not undercook?
must you not undercook?
must they not undercook? 	must I not be undercooking?
must you not be undercooking?
must he not be undercooking?
must we not be undercooking?
must you not be undercooking?
must they not be undercooking? 	must I not have undercooked?
must you not have undercooked?
must he not have undercooked?
must we not have undercooked?
must you not have undercooked?
must they not have undercooked? 	must I not have been undercooking?
must you not have been undercooking?
must he not have been undercooking?
must we not have been undercooking?
must you not have been undercooking?
must they not have been undercooking?