I can tighten you can tighten she can tighten we can tighten you can tighten they can tighten
Forma con V-ing
I can be tightening you can be tightening she can be tightening we can be tightening you can be tightening they can be tightening
Perfecto
I can have tightened you can have tightened she 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 she can have been tightening we can have been tightening you can have been tightening they can have been tightening
Negación
Forma simple
I can't tighten you can't tighten she can't tighten we can't tighten you can't tighten they can't tighten
Forma con V-ing
I can't be tightening you can't be tightening she can't be tightening we can't be tightening you can't be tightening they can't be tightening
Perfecto
I can't have tightened you can't have tightened she can't have tightened we can't have tightened you can't have tightened they can't have tightened
Perfecto con V-ing
I can't have been tightening you can't have been tightening she can't have been tightening we can't have been tightening you can't have been tightening they can't have been tightening
Forma interrogativa
Forma simple
can I tighten? can you tighten? can she tighten? can we tighten? can you tighten? can they tighten?
Forma con V-ing
can I be tightening? can you be tightening? can she be tightening? can we be tightening? can you be tightening? can they be tightening?
Perfecto
can I have tightened? can you have tightened? can she 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 she have been tightening? can we have been tightening? can you have been tightening? can they have been tightening?
Forma interro-negativa
Forma simple
can't I tighten? can't you tighten? can't she tighten? can't we tighten? can't you tighten? can't they tighten?
Forma con V-ing
can't I be tightening? can't you be tightening? can't she be tightening? can't we be tightening? can't you be tightening? can't they be tightening?
Perfecto
can't I have tightened? can't you have tightened? can't she have tightened? can't we have tightened? can't you have tightened? can't they have tightened?
Perfecto con V-ing
can't I have been tightening? can't you have been tightening? can't she have been tightening? can't we have been tightening? can't you have been tightening? can't they have been tightening?