could croak
Verbo regular: croak - croaked- croaked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could croak
you could croak
he could croak
we could croak
you could croak
they could croak 	I could be croaking
you could be croaking
he could be croaking
we could be croaking
you could be croaking
they could be croaking	I could have croaked
you could have croaked
he could have croaked
we could have croaked
you could have croaked
they could have croaked	I could have been croaking
you could have been croaking
he could have been croaking
we could have been croaking
you could have been croaking
they could have been croaking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not croak
you could not croak
he could not croak
we could not croak
you could not croak
they could not croak 	I could not be croaking
you could not be croaking
he could not be croaking
we could not be croaking
you could not be croaking
they could not be croaking	I could not have croaked
you could not have croaked
he could not have croaked
we could not have croaked
you could not have croaked
they could not have croaked	I could not have been croaking
you could not have been croaking
he could not have been croaking
we could not have been croaking
you could not have been croaking
they could not have been croaking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I croak?
could you croak?
could he croak?
could we croak?
could you croak?
could they croak? 	could I be croaking?
could you be croaking?
could he be croaking?
could we be croaking?
could you be croaking?
could they be croaking? 	could I have croaked?
could you have croaked?
could he have croaked?
could we have croaked?
could you have croaked?
could they have croaked? 	could I have been croaking?
could you have been croaking?
could he have been croaking?
could we have been croaking?
could you have been croaking?
could they have been croaking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not croak?
could you not croak?
could he not croak?
could we not croak?
could you not croak?
could they not croak? 	could I not be croaking?
could you not be croaking?
could he not be croaking?
could we not be croaking?
could you not be croaking?
could they not be croaking? 	could I not have croaked?
could you not have croaked?
could he not have croaked?
could we not have croaked?
could you not have croaked?
could they not have croaked? 	could I not have been croaking?
could you not have been croaking?
could he not have been croaking?
could we not have been croaking?
could you not have been croaking?
could they not have been croaking?