could shelve
Verbo regular: shelve - shelved- shelved

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could shelve
you could shelve
he could shelve
we could shelve
you could shelve
they could shelve 	I could be shelving
you could be shelving
he could be shelving
we could be shelving
you could be shelving
they could be shelving	I could have shelved
you could have shelved
he could have shelved
we could have shelved
you could have shelved
they could have shelved	I could have been shelving
you could have been shelving
he could have been shelving
we could have been shelving
you could have been shelving
they could have been shelving	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not shelve
you could not shelve
he could not shelve
we could not shelve
you could not shelve
they could not shelve 	I could not be shelving
you could not be shelving
he could not be shelving
we could not be shelving
you could not be shelving
they could not be shelving	I could not have shelved
you could not have shelved
he could not have shelved
we could not have shelved
you could not have shelved
they could not have shelved	I could not have been shelving
you could not have been shelving
he could not have been shelving
we could not have been shelving
you could not have been shelving
they could not have been shelving	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I shelve?
could you shelve?
could he shelve?
could we shelve?
could you shelve?
could they shelve? 	could I be shelving?
could you be shelving?
could he be shelving?
could we be shelving?
could you be shelving?
could they be shelving? 	could I have shelved?
could you have shelved?
could he have shelved?
could we have shelved?
could you have shelved?
could they have shelved? 	could I have been shelving?
could you have been shelving?
could he have been shelving?
could we have been shelving?
could you have been shelving?
could they have been shelving? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not shelve?
could you not shelve?
could he not shelve?
could we not shelve?
could you not shelve?
could they not shelve? 	could I not be shelving?
could you not be shelving?
could he not be shelving?
could we not be shelving?
could you not be shelving?
could they not be shelving? 	could I not have shelved?
could you not have shelved?
could he not have shelved?
could we not have shelved?
could you not have shelved?
could they not have shelved? 	could I not have been shelving?
could you not have been shelving?
could he not have been shelving?
could we not have been shelving?
could you not have been shelving?
could they not have been shelving?