could clean
Verbo regular: clean - cleaned- cleaned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could clean
you could clean
she could clean
we could clean
you could clean
they could clean 	I could be cleaning
you could be cleaning
she could be cleaning
we could be cleaning
you could be cleaning
they could be cleaning	I could have cleaned
you could have cleaned
she could have cleaned
we could have cleaned
you could have cleaned
they could have cleaned	I could have been cleaning
you could have been cleaning
she could have been cleaning
we could have been cleaning
you could have been cleaning
they could have been cleaning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not clean
you could not clean
she could not clean
we could not clean
you could not clean
they could not clean 	I could not be cleaning
you could not be cleaning
she could not be cleaning
we could not be cleaning
you could not be cleaning
they could not be cleaning	I could not have cleaned
you could not have cleaned
she could not have cleaned
we could not have cleaned
you could not have cleaned
they could not have cleaned	I could not have been cleaning
you could not have been cleaning
she could not have been cleaning
we could not have been cleaning
you could not have been cleaning
they could not have been cleaning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I clean?
could you clean?
could she clean?
could we clean?
could you clean?
could they clean? 	could I be cleaning?
could you be cleaning?
could she be cleaning?
could we be cleaning?
could you be cleaning?
could they be cleaning? 	could I have cleaned?
could you have cleaned?
could she have cleaned?
could we have cleaned?
could you have cleaned?
could they have cleaned? 	could I have been cleaning?
could you have been cleaning?
could she have been cleaning?
could we have been cleaning?
could you have been cleaning?
could they have been cleaning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not clean?
could you not clean?
could she not clean?
could we not clean?
could you not clean?
could they not clean? 	could I not be cleaning?
could you not be cleaning?
could she not be cleaning?
could we not be cleaning?
could you not be cleaning?
could they not be cleaning? 	could I not have cleaned?
could you not have cleaned?
could she not have cleaned?
could we not have cleaned?
could you not have cleaned?
could they not have cleaned? 	could I not have been cleaning?
could you not have been cleaning?
could she not have been cleaning?
could we not have been cleaning?
could you not have been cleaning?
could they not have been cleaning?