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
she must mark
we must mark
you must mark
they must mark 	I must be marking
you must be marking
she must be marking
we must be marking
you must be marking
they must be marking	I must have marked
you must have marked
she 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
she 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 mustn't mark
you mustn't mark
she mustn't mark
we mustn't mark
you mustn't mark
they mustn't mark 	I mustn't be marking
you mustn't be marking
she mustn't be marking
we mustn't be marking
you mustn't be marking
they mustn't be marking	I mustn't have marked
you mustn't have marked
she mustn't have marked
we mustn't have marked
you mustn't have marked
they mustn't have marked	I mustn't have been marking
you mustn't have been marking
she mustn't have been marking
we mustn't have been marking
you mustn't have been marking
they mustn't have been marking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I mark?
must you mark?
must she mark?
must we mark?
must you mark?
must they mark? 	must I be marking?
must you be marking?
must she be marking?
must we be marking?
must you be marking?
must they be marking? 	must I have marked?
must you have marked?
must she 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 she 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 	
mustn't I mark?
mustn't you mark?
mustn't she mark?
mustn't we mark?
mustn't you mark?
mustn't they mark? 	mustn't I be marking?
mustn't you be marking?
mustn't she be marking?
mustn't we be marking?
mustn't you be marking?
mustn't they be marking? 	mustn't I have marked?
mustn't you have marked?
mustn't she have marked?
mustn't we have marked?
mustn't you have marked?
mustn't they have marked? 	mustn't I have been marking?
mustn't you have been marking?
mustn't she have been marking?
mustn't we have been marking?
mustn't you have been marking?
mustn't they have been marking?