could pin
Verbo regular: pin - pinned- pinned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could pin
you could pin
he could pin
we could pin
you could pin
they could pin 	I could be pinning
you could be pinning
he could be pinning
we could be pinning
you could be pinning
they could be pinning	I could have pinned
you could have pinned
he could have pinned
we could have pinned
you could have pinned
they could have pinned	I could have been pinning
you could have been pinning
he could have been pinning
we could have been pinning
you could have been pinning
they could have been pinning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not pin
you could not pin
he could not pin
we could not pin
you could not pin
they could not pin 	I could not be pinning
you could not be pinning
he could not be pinning
we could not be pinning
you could not be pinning
they could not be pinning	I could not have pinned
you could not have pinned
he could not have pinned
we could not have pinned
you could not have pinned
they could not have pinned	I could not have been pinning
you could not have been pinning
he could not have been pinning
we could not have been pinning
you could not have been pinning
they could not have been pinning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I pin?
could you pin?
could he pin?
could we pin?
could you pin?
could they pin? 	could I be pinning?
could you be pinning?
could he be pinning?
could we be pinning?
could you be pinning?
could they be pinning? 	could I have pinned?
could you have pinned?
could he have pinned?
could we have pinned?
could you have pinned?
could they have pinned? 	could I have been pinning?
could you have been pinning?
could he have been pinning?
could we have been pinning?
could you have been pinning?
could they have been pinning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not pin?
could you not pin?
could he not pin?
could we not pin?
could you not pin?
could they not pin? 	could I not be pinning?
could you not be pinning?
could he not be pinning?
could we not be pinning?
could you not be pinning?
could they not be pinning? 	could I not have pinned?
could you not have pinned?
could he not have pinned?
could we not have pinned?
could you not have pinned?
could they not have pinned? 	could I not have been pinning?
could you not have been pinning?
could he not have been pinning?
could we not have been pinning?
could you not have been pinning?
could they not have been pinning?