must precook
Regular verb: precook - precooked- precooked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must precook
you must precook
he must precook
we must precook
you must precook
they must precook 	I must be precooking
you must be precooking
he must be precooking
we must be precooking
you must be precooking
they must be precooking	I must have precooked
you must have precooked
he must have precooked
we must have precooked
you must have precooked
they must have precooked	I must have been precooking
you must have been precooking
he must have been precooking
we must have been precooking
you must have been precooking
they must have been precooking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't precook
you mustn't precook
he mustn't precook
we mustn't precook
you mustn't precook
they mustn't precook 	I mustn't be precooking
you mustn't be precooking
he mustn't be precooking
we mustn't be precooking
you mustn't be precooking
they mustn't be precooking	I mustn't have precooked
you mustn't have precooked
he mustn't have precooked
we mustn't have precooked
you mustn't have precooked
they mustn't have precooked	I mustn't have been precooking
you mustn't have been precooking
he mustn't have been precooking
we mustn't have been precooking
you mustn't have been precooking
they mustn't have been precooking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I precook?
must you precook?
must he precook?
must we precook?
must you precook?
must they precook? 	must I be precooking?
must you be precooking?
must he be precooking?
must we be precooking?
must you be precooking?
must they be precooking? 	must I have precooked?
must you have precooked?
must he have precooked?
must we have precooked?
must you have precooked?
must they have precooked? 	must I have been precooking?
must you have been precooking?
must he have been precooking?
must we have been precooking?
must you have been precooking?
must they have been precooking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I precook?
mustn't you precook?
mustn't he precook?
mustn't we precook?
mustn't you precook?
mustn't they precook? 	mustn't I be precooking?
mustn't you be precooking?
mustn't he be precooking?
mustn't we be precooking?
mustn't you be precooking?
mustn't they be precooking? 	mustn't I have precooked?
mustn't you have precooked?
mustn't he have precooked?
mustn't we have precooked?
mustn't you have precooked?
mustn't they have precooked? 	mustn't I have been precooking?
mustn't you have been precooking?
mustn't he have been precooking?
mustn't we have been precooking?
mustn't you have been precooking?
mustn't they have been precooking?