can tighten
Verbo regolare: tighten - tightened- tightened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I can tighten
you can tighten
he can tighten
we can tighten
you can tighten
they can tighten 	I can be tightening
you can be tightening
he can be tightening
we can be tightening
you can be tightening
they can be tightening	I can have tightened
you can have tightened
he can have tightened
we can have tightened
you can have tightened
they can have tightened	I can have been tightening
you can have been tightening
he can have been tightening
we can have been tightening
you can have been tightening
they can have been tightening	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I cannot tighten
you cannot tighten
he cannot tighten
we cannot tighten
you cannot tighten
they cannot tighten 	I cannot be tightening
you cannot be tightening
he cannot be tightening
we cannot be tightening
you cannot be tightening
they cannot be tightening	I cannot have tightened
you cannot have tightened
he cannot have tightened
we cannot have tightened
you cannot have tightened
they cannot have tightened	I cannot have been tightening
you cannot have been tightening
he cannot have been tightening
we cannot have been tightening
you cannot have been tightening
they cannot have been tightening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
can I tighten?
can you tighten?
can he tighten?
can we tighten?
can you tighten?
can they tighten? 	can I be tightening?
can you be tightening?
can he be tightening?
can we be tightening?
can you be tightening?
can they be tightening? 	can I have tightened?
can you have tightened?
can he have tightened?
can we have tightened?
can you have tightened?
can they have tightened? 	can I have been tightening?
can you have been tightening?
can he have been tightening?
can we have been tightening?
can you have been tightening?
can they have been tightening? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
can I not tighten?
can you not tighten?
can he not tighten?
can we not tighten?
can you not tighten?
can they not tighten? 	can I not be tightening?
can you not be tightening?
can he not be tightening?
can we not be tightening?
can you not be tightening?
can they not be tightening? 	can I not have tightened?
can you not have tightened?
can he not have tightened?
can we not have tightened?
can you not have tightened?
can they not have tightened? 	can I not have been tightening?
can you not have been tightening?
can he not have been tightening?
can we not have been tightening?
can you not have been tightening?
can they not have been tightening?