could sinter
Verbo regular: sinter - sintered- sintered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could sinter
you could sinter
she could sinter
we could sinter
you could sinter
they could sinter 	I could be sintering
you could be sintering
she could be sintering
we could be sintering
you could be sintering
they could be sintering	I could have sintered
you could have sintered
she could have sintered
we could have sintered
you could have sintered
they could have sintered	I could have been sintering
you could have been sintering
she could have been sintering
we could have been sintering
you could have been sintering
they could have been sintering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not sinter
you could not sinter
she could not sinter
we could not sinter
you could not sinter
they could not sinter 	I could not be sintering
you could not be sintering
she could not be sintering
we could not be sintering
you could not be sintering
they could not be sintering	I could not have sintered
you could not have sintered
she could not have sintered
we could not have sintered
you could not have sintered
they could not have sintered	I could not have been sintering
you could not have been sintering
she could not have been sintering
we could not have been sintering
you could not have been sintering
they could not have been sintering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I sinter?
could you sinter?
could she sinter?
could we sinter?
could you sinter?
could they sinter? 	could I be sintering?
could you be sintering?
could she be sintering?
could we be sintering?
could you be sintering?
could they be sintering? 	could I have sintered?
could you have sintered?
could she have sintered?
could we have sintered?
could you have sintered?
could they have sintered? 	could I have been sintering?
could you have been sintering?
could she have been sintering?
could we have been sintering?
could you have been sintering?
could they have been sintering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not sinter?
could you not sinter?
could she not sinter?
could we not sinter?
could you not sinter?
could they not sinter? 	could I not be sintering?
could you not be sintering?
could she not be sintering?
could we not be sintering?
could you not be sintering?
could they not be sintering? 	could I not have sintered?
could you not have sintered?
could she not have sintered?
could we not have sintered?
could you not have sintered?
could they not have sintered? 	could I not have been sintering?
could you not have been sintering?
could she not have been sintering?
could we not have been sintering?
could you not have been sintering?
could they not have been sintering?