could thorn
Verbo regular: thorn - thorned- thorned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could thorn
you could thorn
he could thorn
we could thorn
you could thorn
they could thorn 	I could be thorning
you could be thorning
he could be thorning
we could be thorning
you could be thorning
they could be thorning	I could have thorned
you could have thorned
he could have thorned
we could have thorned
you could have thorned
they could have thorned	I could have been thorning
you could have been thorning
he could have been thorning
we could have been thorning
you could have been thorning
they could have been thorning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not thorn
you could not thorn
he could not thorn
we could not thorn
you could not thorn
they could not thorn 	I could not be thorning
you could not be thorning
he could not be thorning
we could not be thorning
you could not be thorning
they could not be thorning	I could not have thorned
you could not have thorned
he could not have thorned
we could not have thorned
you could not have thorned
they could not have thorned	I could not have been thorning
you could not have been thorning
he could not have been thorning
we could not have been thorning
you could not have been thorning
they could not have been thorning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I thorn?
could you thorn?
could he thorn?
could we thorn?
could you thorn?
could they thorn? 	could I be thorning?
could you be thorning?
could he be thorning?
could we be thorning?
could you be thorning?
could they be thorning? 	could I have thorned?
could you have thorned?
could he have thorned?
could we have thorned?
could you have thorned?
could they have thorned? 	could I have been thorning?
could you have been thorning?
could he have been thorning?
could we have been thorning?
could you have been thorning?
could they have been thorning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not thorn?
could you not thorn?
could he not thorn?
could we not thorn?
could you not thorn?
could they not thorn? 	could I not be thorning?
could you not be thorning?
could he not be thorning?
could we not be thorning?
could you not be thorning?
could they not be thorning? 	could I not have thorned?
could you not have thorned?
could he not have thorned?
could we not have thorned?
could you not have thorned?
could they not have thorned? 	could I not have been thorning?
could you not have been thorning?
could he not have been thorning?
could we not have been thorning?
could you not have been thorning?
could they not have been thorning?