can tough
Verbo regular: tough - toughed- toughed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can tough
you can tough
he can tough
we can tough
you can tough
they can tough 	I can be toughing
you can be toughing
he can be toughing
we can be toughing
you can be toughing
they can be toughing	I can have toughed
you can have toughed
he 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
he can have been toughing
we can have been toughing
you can have been toughing
they can have been toughing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I cannot tough
you cannot tough
he cannot tough
we cannot tough
you cannot tough
they cannot tough 	I cannot be toughing
you cannot be toughing
he cannot be toughing
we cannot be toughing
you cannot be toughing
they cannot be toughing	I cannot have toughed
you cannot have toughed
he 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
he cannot have been toughing
we cannot have been toughing
you cannot have been toughing
they cannot have been toughing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I tough?
can you tough?
can he tough?
can we tough?
can you tough?
can they tough? 	can I be toughing?
can you be toughing?
can he be toughing?
can we be toughing?
can you be toughing?
can they be toughing? 	can I have toughed?
can you have toughed?
can he 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 he have been toughing?
can we have been toughing?
can you have been toughing?
can they have been toughing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I not tough?
can you not tough?
can he 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 he 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 he 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 he not have been toughing?
can we not have been toughing?
can you not have been toughing?
can they not have been toughing?