must sinter
Verbo regular: sinter - sintered- sintered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must sinter
you must sinter
he must sinter
we must sinter
you must sinter
they must sinter 	I must be sintering
you must be sintering
he must be sintering
we must be sintering
you must be sintering
they must be sintering	I must have sintered
you must have sintered
he must have sintered
we must have sintered
you must have sintered
they must have sintered	I must have been sintering
you must have been sintering
he must have been sintering
we must have been sintering
you must have been sintering
they must have been sintering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't sinter
you mustn't sinter
he mustn't sinter
we mustn't sinter
you mustn't sinter
they mustn't sinter 	I mustn't be sintering
you mustn't be sintering
he mustn't be sintering
we mustn't be sintering
you mustn't be sintering
they mustn't be sintering	I mustn't have sintered
you mustn't have sintered
he mustn't have sintered
we mustn't have sintered
you mustn't have sintered
they mustn't have sintered	I mustn't have been sintering
you mustn't have been sintering
he mustn't have been sintering
we mustn't have been sintering
you mustn't have been sintering
they mustn't have been sintering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I sinter?
must you sinter?
must he sinter?
must we sinter?
must you sinter?
must they sinter? 	must I be sintering?
must you be sintering?
must he be sintering?
must we be sintering?
must you be sintering?
must they be sintering? 	must I have sintered?
must you have sintered?
must he have sintered?
must we have sintered?
must you have sintered?
must they have sintered? 	must I have been sintering?
must you have been sintering?
must he have been sintering?
must we have been sintering?
must you have been sintering?
must they have been sintering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I sinter?
mustn't you sinter?
mustn't he sinter?
mustn't we sinter?
mustn't you sinter?
mustn't they sinter? 	mustn't I be sintering?
mustn't you be sintering?
mustn't he be sintering?
mustn't we be sintering?
mustn't you be sintering?
mustn't they be sintering? 	mustn't I have sintered?
mustn't you have sintered?
mustn't he have sintered?
mustn't we have sintered?
mustn't you have sintered?
mustn't they have sintered? 	mustn't I have been sintering?
mustn't you have been sintering?
mustn't he have been sintering?
mustn't we have been sintering?
mustn't you have been sintering?
mustn't they have been sintering?