Conjugación del verbo inglés
CAN TIGHTEN

Verbo regular: tighten - tightened - tightened

Afirmación

Forma simple	Forma 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
Perfecto	Perfecto con V-ing
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

Negación

Forma simple	Forma con V-ing
I can't tighten you can't tighten he can't tighten we can't tighten you can't tighten they can't tighten	I can't be tightening you can't be tightening he can't be tightening we can't be tightening you can't be tightening they can't be tightening
Perfecto	Perfecto con V-ing
I can't have tightened you can't have tightened he can't have tightened we can't have tightened you can't have tightened they can't have tightened	I can't have been tightening you can't have been tightening he 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	Forma 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?
Perfecto	Perfecto con V-ing
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 simple	Forma con V-ing
can't I tighten? can't you tighten? can't he tighten? can't we tighten? can't you tighten? can't they tighten?	can't I be tightening? can't you be tightening? can't he be tightening? can't we be tightening? can't you be tightening? can't they be tightening?
Perfecto	Perfecto con V-ing
can't I have tightened? can't you have tightened? can't he have tightened? can't we have tightened? can't you have tightened? can't they have tightened?	can't I have been tightening? can't you have been tightening? can't he have been tightening? can't we have been tightening? can't you have been tightening? can't they have been tightening?