can straighten
Verbo regular: straighten - straightened- straightened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can straighten
you can straighten
he can straighten
we can straighten
you can straighten
they can straighten 	I can be straightening
you can be straightening
he can be straightening
we can be straightening
you can be straightening
they can be straightening	I can have straightened
you can have straightened
he can have straightened
we can have straightened
you can have straightened
they can have straightened	I can have been straightening
you can have been straightening
he can have been straightening
we can have been straightening
you can have been straightening
they can have been straightening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot straighten
you cannot straighten
he cannot straighten
we cannot straighten
you cannot straighten
they cannot straighten 	I cannot be straightening
you cannot be straightening
he cannot be straightening
we cannot be straightening
you cannot be straightening
they cannot be straightening	I cannot have straightened
you cannot have straightened
he cannot have straightened
we cannot have straightened
you cannot have straightened
they cannot have straightened	I cannot have been straightening
you cannot have been straightening
he cannot have been straightening
we cannot have been straightening
you cannot have been straightening
they cannot have been straightening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I straighten?
can you straighten?
can he straighten?
can we straighten?
can you straighten?
can they straighten? 	can I be straightening?
can you be straightening?
can he be straightening?
can we be straightening?
can you be straightening?
can they be straightening? 	can I have straightened?
can you have straightened?
can he have straightened?
can we have straightened?
can you have straightened?
can they have straightened? 	can I have been straightening?
can you have been straightening?
can he have been straightening?
can we have been straightening?
can you have been straightening?
can they have been straightening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not straighten?
can you not straighten?
can he not straighten?
can we not straighten?
can you not straighten?
can they not straighten? 	can I not be straightening?
can you not be straightening?
can he not be straightening?
can we not be straightening?
can you not be straightening?
can they not be straightening? 	can I not have straightened?
can you not have straightened?
can he not have straightened?
can we not have straightened?
can you not have straightened?
can they not have straightened? 	can I not have been straightening?
can you not have been straightening?
can he not have been straightening?
can we not have been straightening?
can you not have been straightening?
can they not have been straightening?