could creak
Verbo regular: creak - creaked- creaked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could creak
you could creak
he could creak
we could creak
you could creak
they could creak 	I could be creaking
you could be creaking
he could be creaking
we could be creaking
you could be creaking
they could be creaking	I could have creaked
you could have creaked
he could have creaked
we could have creaked
you could have creaked
they could have creaked	I could have been creaking
you could have been creaking
he could have been creaking
we could have been creaking
you could have been creaking
they could have been creaking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not creak
you could not creak
he could not creak
we could not creak
you could not creak
they could not creak 	I could not be creaking
you could not be creaking
he could not be creaking
we could not be creaking
you could not be creaking
they could not be creaking	I could not have creaked
you could not have creaked
he could not have creaked
we could not have creaked
you could not have creaked
they could not have creaked	I could not have been creaking
you could not have been creaking
he could not have been creaking
we could not have been creaking
you could not have been creaking
they could not have been creaking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I creak?
could you creak?
could he creak?
could we creak?
could you creak?
could they creak? 	could I be creaking?
could you be creaking?
could he be creaking?
could we be creaking?
could you be creaking?
could they be creaking? 	could I have creaked?
could you have creaked?
could he have creaked?
could we have creaked?
could you have creaked?
could they have creaked? 	could I have been creaking?
could you have been creaking?
could he have been creaking?
could we have been creaking?
could you have been creaking?
could they have been creaking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not creak?
could you not creak?
could he not creak?
could we not creak?
could you not creak?
could they not creak? 	could I not be creaking?
could you not be creaking?
could he not be creaking?
could we not be creaking?
could you not be creaking?
could they not be creaking? 	could I not have creaked?
could you not have creaked?
could he not have creaked?
could we not have creaked?
could you not have creaked?
could they not have creaked? 	could I not have been creaking?
could you not have been creaking?
could he not have been creaking?
could we not have been creaking?
could you not have been creaking?
could they not have been creaking?