could backcheck
Verbo regular: backcheck - backchecked- backchecked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could backcheck
you could backcheck
she could backcheck
we could backcheck
you could backcheck
they could backcheck 	I could be backchecking
you could be backchecking
she could be backchecking
we could be backchecking
you could be backchecking
they could be backchecking	I could have backchecked
you could have backchecked
she could have backchecked
we could have backchecked
you could have backchecked
they could have backchecked	I could have been backchecking
you could have been backchecking
she could have been backchecking
we could have been backchecking
you could have been backchecking
they could have been backchecking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not backcheck
you could not backcheck
she could not backcheck
we could not backcheck
you could not backcheck
they could not backcheck 	I could not be backchecking
you could not be backchecking
she could not be backchecking
we could not be backchecking
you could not be backchecking
they could not be backchecking	I could not have backchecked
you could not have backchecked
she could not have backchecked
we could not have backchecked
you could not have backchecked
they could not have backchecked	I could not have been backchecking
you could not have been backchecking
she could not have been backchecking
we could not have been backchecking
you could not have been backchecking
they could not have been backchecking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I backcheck?
could you backcheck?
could she backcheck?
could we backcheck?
could you backcheck?
could they backcheck? 	could I be backchecking?
could you be backchecking?
could she be backchecking?
could we be backchecking?
could you be backchecking?
could they be backchecking? 	could I have backchecked?
could you have backchecked?
could she have backchecked?
could we have backchecked?
could you have backchecked?
could they have backchecked? 	could I have been backchecking?
could you have been backchecking?
could she have been backchecking?
could we have been backchecking?
could you have been backchecking?
could they have been backchecking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not backcheck?
could you not backcheck?
could she not backcheck?
could we not backcheck?
could you not backcheck?
could they not backcheck? 	could I not be backchecking?
could you not be backchecking?
could she not be backchecking?
could we not be backchecking?
could you not be backchecking?
could they not be backchecking? 	could I not have backchecked?
could you not have backchecked?
could she not have backchecked?
could we not have backchecked?
could you not have backchecked?
could they not have backchecked? 	could I not have been backchecking?
could you not have been backchecking?
could she not have been backchecking?
could we not have been backchecking?
could you not have been backchecking?
could they not have been backchecking?