can croak
Verbo regular: croak - croaked- croaked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can croak
you can croak
he can croak
we can croak
you can croak
they can croak 	I can be croaking
you can be croaking
he can be croaking
we can be croaking
you can be croaking
they can be croaking	I can have croaked
you can have croaked
he can have croaked
we can have croaked
you can have croaked
they can have croaked	I can have been croaking
you can have been croaking
he can have been croaking
we can have been croaking
you can have been croaking
they can have been croaking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot croak
you cannot croak
he cannot croak
we cannot croak
you cannot croak
they cannot croak 	I cannot be croaking
you cannot be croaking
he cannot be croaking
we cannot be croaking
you cannot be croaking
they cannot be croaking	I cannot have croaked
you cannot have croaked
he cannot have croaked
we cannot have croaked
you cannot have croaked
they cannot have croaked	I cannot have been croaking
you cannot have been croaking
he cannot have been croaking
we cannot have been croaking
you cannot have been croaking
they cannot have been croaking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I croak?
can you croak?
can he croak?
can we croak?
can you croak?
can they croak? 	can I be croaking?
can you be croaking?
can he be croaking?
can we be croaking?
can you be croaking?
can they be croaking? 	can I have croaked?
can you have croaked?
can he have croaked?
can we have croaked?
can you have croaked?
can they have croaked? 	can I have been croaking?
can you have been croaking?
can he have been croaking?
can we have been croaking?
can you have been croaking?
can they have been croaking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not croak?
can you not croak?
can he not croak?
can we not croak?
can you not croak?
can they not croak? 	can I not be croaking?
can you not be croaking?
can he not be croaking?
can we not be croaking?
can you not be croaking?
can they not be croaking? 	can I not have croaked?
can you not have croaked?
can he not have croaked?
can we not have croaked?
can you not have croaked?
can they not have croaked? 	can I not have been croaking?
can you not have been croaking?
can he not have been croaking?
can we not have been croaking?
can you not have been croaking?
can they not have been croaking?