I can tighten you can tighten he can tighten we can tighten you can tighten they can tighten
Forma con V-ing
I can be tightening you can be tightening he can be tightening we can be tightening you can be tightening they can be tightening
Perfecto
I can have tightened you can have tightened he can have tightened we can have tightened you can have tightened they can have tightened
Perfecto con V-ing
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
Negación
Forma simple
I cannot tighten you cannot tighten he cannot tighten we cannot tighten you cannot tighten they cannot tighten
Forma con V-ing
I cannot be tightening you cannot be tightening he cannot be tightening we cannot be tightening you cannot be tightening they cannot be tightening
Perfecto
I cannot have tightened you cannot have tightened he cannot have tightened we cannot have tightened you cannot have tightened they cannot have tightened
Perfecto con V-ing
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 simple
can I tighten? can you tighten? can he tighten? can we tighten? can you tighten? can they tighten?
Forma con V-ing
can I be tightening? can you be tightening? can he be tightening? can we be tightening? can you be tightening? can they be tightening?
Perfecto
can I have tightened? can you have tightened? can he have tightened? can we have tightened? can you have tightened? can they have tightened?
Perfecto con V-ing
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 simple
can I not tighten? can you not tighten? can he not tighten? can we not tighten? can you not tighten? can they not tighten?
Forma con V-ing
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?
Perfecto
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?
Perfecto con V-ing
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?