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 couldn't sinter
you couldn't sinter
she couldn't sinter
we couldn't sinter
you couldn't sinter
they couldn't sinter 	I couldn't be sintering
you couldn't be sintering
she couldn't be sintering
we couldn't be sintering
you couldn't be sintering
they couldn't be sintering	I couldn't have sintered
you couldn't have sintered
she couldn't have sintered
we couldn't have sintered
you couldn't have sintered
they couldn't have sintered	I couldn't have been sintering
you couldn't have been sintering
she couldn't have been sintering
we couldn't have been sintering
you couldn't have been sintering
they couldn't 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 	
couldn't I sinter?
couldn't you sinter?
couldn't she sinter?
couldn't we sinter?
couldn't you sinter?
couldn't they sinter? 	couldn't I be sintering?
couldn't you be sintering?
couldn't she be sintering?
couldn't we be sintering?
couldn't you be sintering?
couldn't they be sintering? 	couldn't I have sintered?
couldn't you have sintered?
couldn't she have sintered?
couldn't we have sintered?
couldn't you have sintered?
couldn't they have sintered? 	couldn't I have been sintering?
couldn't you have been sintering?
couldn't she have been sintering?
couldn't we have been sintering?
couldn't you have been sintering?
couldn't they have been sintering?