can scratch
Verbo regular: scratch - scratched- scratched

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can scratch
you can scratch
he can scratch
we can scratch
you can scratch
they can scratch 	I can be scratching
you can be scratching
he can be scratching
we can be scratching
you can be scratching
they can be scratching	I can have scratched
you can have scratched
he can have scratched
we can have scratched
you can have scratched
they can have scratched	I can have been scratching
you can have been scratching
he can have been scratching
we can have been scratching
you can have been scratching
they can have been scratching	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot scratch
you cannot scratch
he cannot scratch
we cannot scratch
you cannot scratch
they cannot scratch 	I cannot be scratching
you cannot be scratching
he cannot be scratching
we cannot be scratching
you cannot be scratching
they cannot be scratching	I cannot have scratched
you cannot have scratched
he cannot have scratched
we cannot have scratched
you cannot have scratched
they cannot have scratched	I cannot have been scratching
you cannot have been scratching
he cannot have been scratching
we cannot have been scratching
you cannot have been scratching
they cannot have been scratching	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I scratch?
can you scratch?
can he scratch?
can we scratch?
can you scratch?
can they scratch? 	can I be scratching?
can you be scratching?
can he be scratching?
can we be scratching?
can you be scratching?
can they be scratching? 	can I have scratched?
can you have scratched?
can he have scratched?
can we have scratched?
can you have scratched?
can they have scratched? 	can I have been scratching?
can you have been scratching?
can he have been scratching?
can we have been scratching?
can you have been scratching?
can they have been scratching? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not scratch?
can you not scratch?
can he not scratch?
can we not scratch?
can you not scratch?
can they not scratch? 	can I not be scratching?
can you not be scratching?
can he not be scratching?
can we not be scratching?
can you not be scratching?
can they not be scratching? 	can I not have scratched?
can you not have scratched?
can he not have scratched?
can we not have scratched?
can you not have scratched?
can they not have scratched? 	can I not have been scratching?
can you not have been scratching?
can he not have been scratching?
can we not have been scratching?
can you not have been scratching?
can they not have been scratching?