must litter
Verbo regular: litter - littered- littered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must litter
you must litter
he must litter
we must litter
you must litter
they must litter 	I must be littering
you must be littering
he must be littering
we must be littering
you must be littering
they must be littering	I must have littered
you must have littered
he must have littered
we must have littered
you must have littered
they must have littered	I must have been littering
you must have been littering
he must have been littering
we must have been littering
you must have been littering
they must have been littering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't litter
you mustn't litter
he mustn't litter
we mustn't litter
you mustn't litter
they mustn't litter 	I mustn't be littering
you mustn't be littering
he mustn't be littering
we mustn't be littering
you mustn't be littering
they mustn't be littering	I mustn't have littered
you mustn't have littered
he mustn't have littered
we mustn't have littered
you mustn't have littered
they mustn't have littered	I mustn't have been littering
you mustn't have been littering
he mustn't have been littering
we mustn't have been littering
you mustn't have been littering
they mustn't have been littering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I litter?
must you litter?
must he litter?
must we litter?
must you litter?
must they litter? 	must I be littering?
must you be littering?
must he be littering?
must we be littering?
must you be littering?
must they be littering? 	must I have littered?
must you have littered?
must he have littered?
must we have littered?
must you have littered?
must they have littered? 	must I have been littering?
must you have been littering?
must he have been littering?
must we have been littering?
must you have been littering?
must they have been littering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I litter?
mustn't you litter?
mustn't he litter?
mustn't we litter?
mustn't you litter?
mustn't they litter? 	mustn't I be littering?
mustn't you be littering?
mustn't he be littering?
mustn't we be littering?
mustn't you be littering?
mustn't they be littering? 	mustn't I have littered?
mustn't you have littered?
mustn't he have littered?
mustn't we have littered?
mustn't you have littered?
mustn't they have littered? 	mustn't I have been littering?
mustn't you have been littering?
mustn't he have been littering?
mustn't we have been littering?
mustn't you have been littering?
mustn't they have been littering?