could shadowbox
Verbo regular: shadowbox - shadowboxed- shadowboxed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could shadowbox
you could shadowbox
she could shadowbox
we could shadowbox
you could shadowbox
they could shadowbox 	I could be shadowboxing
you could be shadowboxing
she could be shadowboxing
we could be shadowboxing
you could be shadowboxing
they could be shadowboxing	I could have shadowboxed
you could have shadowboxed
she could have shadowboxed
we could have shadowboxed
you could have shadowboxed
they could have shadowboxed	I could have been shadowboxing
you could have been shadowboxing
she could have been shadowboxing
we could have been shadowboxing
you could have been shadowboxing
they could have been shadowboxing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not shadowbox
you could not shadowbox
she could not shadowbox
we could not shadowbox
you could not shadowbox
they could not shadowbox 	I could not be shadowboxing
you could not be shadowboxing
she could not be shadowboxing
we could not be shadowboxing
you could not be shadowboxing
they could not be shadowboxing	I could not have shadowboxed
you could not have shadowboxed
she could not have shadowboxed
we could not have shadowboxed
you could not have shadowboxed
they could not have shadowboxed	I could not have been shadowboxing
you could not have been shadowboxing
she could not have been shadowboxing
we could not have been shadowboxing
you could not have been shadowboxing
they could not have been shadowboxing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I shadowbox?
could you shadowbox?
could she shadowbox?
could we shadowbox?
could you shadowbox?
could they shadowbox? 	could I be shadowboxing?
could you be shadowboxing?
could she be shadowboxing?
could we be shadowboxing?
could you be shadowboxing?
could they be shadowboxing? 	could I have shadowboxed?
could you have shadowboxed?
could she have shadowboxed?
could we have shadowboxed?
could you have shadowboxed?
could they have shadowboxed? 	could I have been shadowboxing?
could you have been shadowboxing?
could she have been shadowboxing?
could we have been shadowboxing?
could you have been shadowboxing?
could they have been shadowboxing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not shadowbox?
could you not shadowbox?
could she not shadowbox?
could we not shadowbox?
could you not shadowbox?
could they not shadowbox? 	could I not be shadowboxing?
could you not be shadowboxing?
could she not be shadowboxing?
could we not be shadowboxing?
could you not be shadowboxing?
could they not be shadowboxing? 	could I not have shadowboxed?
could you not have shadowboxed?
could she not have shadowboxed?
could we not have shadowboxed?
could you not have shadowboxed?
could they not have shadowboxed? 	could I not have been shadowboxing?
could you not have been shadowboxing?
could she not have been shadowboxing?
could we not have been shadowboxing?
could you not have been shadowboxing?
could they not have been shadowboxing?