can crack
Verbo regular: crack - cracked- cracked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can crack
you can crack
he can crack
we can crack
you can crack
they can crack 	I can be cracking
you can be cracking
he can be cracking
we can be cracking
you can be cracking
they can be cracking	I can have cracked
you can have cracked
he can have cracked
we can have cracked
you can have cracked
they can have cracked	I can have been cracking
you can have been cracking
he can have been cracking
we can have been cracking
you can have been cracking
they can have been cracking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot crack
you cannot crack
he cannot crack
we cannot crack
you cannot crack
they cannot crack 	I cannot be cracking
you cannot be cracking
he cannot be cracking
we cannot be cracking
you cannot be cracking
they cannot be cracking	I cannot have cracked
you cannot have cracked
he cannot have cracked
we cannot have cracked
you cannot have cracked
they cannot have cracked	I cannot have been cracking
you cannot have been cracking
he cannot have been cracking
we cannot have been cracking
you cannot have been cracking
they cannot have been cracking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I crack?
can you crack?
can he crack?
can we crack?
can you crack?
can they crack? 	can I be cracking?
can you be cracking?
can he be cracking?
can we be cracking?
can you be cracking?
can they be cracking? 	can I have cracked?
can you have cracked?
can he have cracked?
can we have cracked?
can you have cracked?
can they have cracked? 	can I have been cracking?
can you have been cracking?
can he have been cracking?
can we have been cracking?
can you have been cracking?
can they have been cracking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not crack?
can you not crack?
can he not crack?
can we not crack?
can you not crack?
can they not crack? 	can I not be cracking?
can you not be cracking?
can he not be cracking?
can we not be cracking?
can you not be cracking?
can they not be cracking? 	can I not have cracked?
can you not have cracked?
can he not have cracked?
can we not have cracked?
can you not have cracked?
can they not have cracked? 	can I not have been cracking?
can you not have been cracking?
can he not have been cracking?
can we not have been cracking?
can you not have been cracking?
can they not have been cracking?