can tough
Verbo regular: tough - toughed- toughed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can tough
you can tough
she can tough
we can tough
you can tough
they can tough 	I can be toughing
you can be toughing
she can be toughing
we can be toughing
you can be toughing
they can be toughing	I can have toughed
you can have toughed
she can have toughed
we can have toughed
you can have toughed
they can have toughed	I can have been toughing
you can have been toughing
she can have been toughing
we can have been toughing
you can have been toughing
they can have been toughing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot tough
you cannot tough
she cannot tough
we cannot tough
you cannot tough
they cannot tough 	I cannot be toughing
you cannot be toughing
she cannot be toughing
we cannot be toughing
you cannot be toughing
they cannot be toughing	I cannot have toughed
you cannot have toughed
she cannot have toughed
we cannot have toughed
you cannot have toughed
they cannot have toughed	I cannot have been toughing
you cannot have been toughing
she cannot have been toughing
we cannot have been toughing
you cannot have been toughing
they cannot have been toughing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I tough?
can you tough?
can she tough?
can we tough?
can you tough?
can they tough? 	can I be toughing?
can you be toughing?
can she be toughing?
can we be toughing?
can you be toughing?
can they be toughing? 	can I have toughed?
can you have toughed?
can she have toughed?
can we have toughed?
can you have toughed?
can they have toughed? 	can I have been toughing?
can you have been toughing?
can she have been toughing?
can we have been toughing?
can you have been toughing?
can they have been toughing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not tough?
can you not tough?
can she not tough?
can we not tough?
can you not tough?
can they not tough? 	can I not be toughing?
can you not be toughing?
can she not be toughing?
can we not be toughing?
can you not be toughing?
can they not be toughing? 	can I not have toughed?
can you not have toughed?
can she not have toughed?
can we not have toughed?
can you not have toughed?
can they not have toughed? 	can I not have been toughing?
can you not have been toughing?
can she not have been toughing?
can we not have been toughing?
can you not have been toughing?
can they not have been toughing?