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 must not sinter
you must not sinter
he must not sinter
we must not sinter
you must not sinter
they must not sinter 	I must not be sintering
you must not be sintering
he must not be sintering
we must not be sintering
you must not be sintering
they must not be sintering	I must not have sintered
you must not have sintered
he must not have sintered
we must not have sintered
you must not have sintered
they must not have sintered	I must not have been sintering
you must not have been sintering
he must not have been sintering
we must not have been sintering
you must not have been sintering
they must not 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 	
must I not sinter?
must you not sinter?
must he not sinter?
must we not sinter?
must you not sinter?
must they not sinter? 	must I not be sintering?
must you not be sintering?
must he not be sintering?
must we not be sintering?
must you not be sintering?
must they not be sintering? 	must I not have sintered?
must you not have sintered?
must he not have sintered?
must we not have sintered?
must you not have sintered?
must they not have sintered? 	must I not have been sintering?
must you not have been sintering?
must he not have been sintering?
must we not have been sintering?
must you not have been sintering?
must they not have been sintering?