could singe
Verbo regolare: singe - singed- singed

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could singe
you could singe
he could singe
we could singe
you could singe
they could singe 	I could be singing
you could be singing
he could be singing
we could be singing
you could be singing
they could be singing	I could have singed
you could have singed
he could have singed
we could have singed
you could have singed
they could have singed	I could have been singing
you could have been singing
he could have been singing
we could have been singing
you could have been singing
they could have been singing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not singe
you could not singe
he could not singe
we could not singe
you could not singe
they could not singe 	I could not be singing
you could not be singing
he could not be singing
we could not be singing
you could not be singing
they could not be singing	I could not have singed
you could not have singed
he could not have singed
we could not have singed
you could not have singed
they could not have singed	I could not have been singing
you could not have been singing
he could not have been singing
we could not have been singing
you could not have been singing
they could not have been singing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I singe?
could you singe?
could he singe?
could we singe?
could you singe?
could they singe? 	could I be singing?
could you be singing?
could he be singing?
could we be singing?
could you be singing?
could they be singing? 	could I have singed?
could you have singed?
could he have singed?
could we have singed?
could you have singed?
could they have singed? 	could I have been singing?
could you have been singing?
could he have been singing?
could we have been singing?
could you have been singing?
could they have been singing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not singe?
could you not singe?
could he not singe?
could we not singe?
could you not singe?
could they not singe? 	could I not be singing?
could you not be singing?
could he not be singing?
could we not be singing?
could you not be singing?
could they not be singing? 	could I not have singed?
could you not have singed?
could he not have singed?
could we not have singed?
could you not have singed?
could they not have singed? 	could I not have been singing?
could you not have been singing?
could he not have been singing?
could we not have been singing?
could you not have been singing?
could they not have been singing?