must mark
Verbo regular: mark - marked- marked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must mark
you must mark
he must mark
we must mark
you must mark
they must mark 	I must be marking
you must be marking
he must be marking
we must be marking
you must be marking
they must be marking	I must have marked
you must have marked
he must have marked
we must have marked
you must have marked
they must have marked	I must have been marking
you must have been marking
he must have been marking
we must have been marking
you must have been marking
they must have been marking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not mark
you must not mark
he must not mark
we must not mark
you must not mark
they must not mark 	I must not be marking
you must not be marking
he must not be marking
we must not be marking
you must not be marking
they must not be marking	I must not have marked
you must not have marked
he must not have marked
we must not have marked
you must not have marked
they must not have marked	I must not have been marking
you must not have been marking
he must not have been marking
we must not have been marking
you must not have been marking
they must not have been marking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I mark?
must you mark?
must he mark?
must we mark?
must you mark?
must they mark? 	must I be marking?
must you be marking?
must he be marking?
must we be marking?
must you be marking?
must they be marking? 	must I have marked?
must you have marked?
must he have marked?
must we have marked?
must you have marked?
must they have marked? 	must I have been marking?
must you have been marking?
must he have been marking?
must we have been marking?
must you have been marking?
must they have been marking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not mark?
must you not mark?
must he not mark?
must we not mark?
must you not mark?
must they not mark? 	must I not be marking?
must you not be marking?
must he not be marking?
must we not be marking?
must you not be marking?
must they not be marking? 	must I not have marked?
must you not have marked?
must he not have marked?
must we not have marked?
must you not have marked?
must they not have marked? 	must I not have been marking?
must you not have been marking?
must he not have been marking?
must we not have been marking?
must you not have been marking?
must they not have been marking?