could glass
Verbo regular: glass - glassed- glassed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could glass
you could glass
he could glass
we could glass
you could glass
they could glass 	I could be glassing
you could be glassing
he could be glassing
we could be glassing
you could be glassing
they could be glassing	I could have glassed
you could have glassed
he could have glassed
we could have glassed
you could have glassed
they could have glassed	I could have been glassing
you could have been glassing
he could have been glassing
we could have been glassing
you could have been glassing
they could have been glassing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not glass
you could not glass
he could not glass
we could not glass
you could not glass
they could not glass 	I could not be glassing
you could not be glassing
he could not be glassing
we could not be glassing
you could not be glassing
they could not be glassing	I could not have glassed
you could not have glassed
he could not have glassed
we could not have glassed
you could not have glassed
they could not have glassed	I could not have been glassing
you could not have been glassing
he could not have been glassing
we could not have been glassing
you could not have been glassing
they could not have been glassing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I glass?
could you glass?
could he glass?
could we glass?
could you glass?
could they glass? 	could I be glassing?
could you be glassing?
could he be glassing?
could we be glassing?
could you be glassing?
could they be glassing? 	could I have glassed?
could you have glassed?
could he have glassed?
could we have glassed?
could you have glassed?
could they have glassed? 	could I have been glassing?
could you have been glassing?
could he have been glassing?
could we have been glassing?
could you have been glassing?
could they have been glassing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not glass?
could you not glass?
could he not glass?
could we not glass?
could you not glass?
could they not glass? 	could I not be glassing?
could you not be glassing?
could he not be glassing?
could we not be glassing?
could you not be glassing?
could they not be glassing? 	could I not have glassed?
could you not have glassed?
could he not have glassed?
could we not have glassed?
could you not have glassed?
could they not have glassed? 	could I not have been glassing?
could you not have been glassing?
could he not have been glassing?
could we not have been glassing?
could you not have been glassing?
could they not have been glassing?