could shuttle
Verbo regular: shuttle - shuttled- shuttled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could shuttle
you could shuttle
she could shuttle
we could shuttle
you could shuttle
they could shuttle 	I could be shuttling
you could be shuttling
she could be shuttling
we could be shuttling
you could be shuttling
they could be shuttling	I could have shuttled
you could have shuttled
she could have shuttled
we could have shuttled
you could have shuttled
they could have shuttled	I could have been shuttling
you could have been shuttling
she could have been shuttling
we could have been shuttling
you could have been shuttling
they could have been shuttling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not shuttle
you could not shuttle
she could not shuttle
we could not shuttle
you could not shuttle
they could not shuttle 	I could not be shuttling
you could not be shuttling
she could not be shuttling
we could not be shuttling
you could not be shuttling
they could not be shuttling	I could not have shuttled
you could not have shuttled
she could not have shuttled
we could not have shuttled
you could not have shuttled
they could not have shuttled	I could not have been shuttling
you could not have been shuttling
she could not have been shuttling
we could not have been shuttling
you could not have been shuttling
they could not have been shuttling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I shuttle?
could you shuttle?
could she shuttle?
could we shuttle?
could you shuttle?
could they shuttle? 	could I be shuttling?
could you be shuttling?
could she be shuttling?
could we be shuttling?
could you be shuttling?
could they be shuttling? 	could I have shuttled?
could you have shuttled?
could she have shuttled?
could we have shuttled?
could you have shuttled?
could they have shuttled? 	could I have been shuttling?
could you have been shuttling?
could she have been shuttling?
could we have been shuttling?
could you have been shuttling?
could they have been shuttling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not shuttle?
could you not shuttle?
could she not shuttle?
could we not shuttle?
could you not shuttle?
could they not shuttle? 	could I not be shuttling?
could you not be shuttling?
could she not be shuttling?
could we not be shuttling?
could you not be shuttling?
could they not be shuttling? 	could I not have shuttled?
could you not have shuttled?
could she not have shuttled?
could we not have shuttled?
could you not have shuttled?
could they not have shuttled? 	could I not have been shuttling?
could you not have been shuttling?
could she not have been shuttling?
could we not have been shuttling?
could you not have been shuttling?
could they not have been shuttling?