should tighten
Verbo regular: tighten - tightened- tightened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should tighten
you should tighten
he should tighten
we should tighten
you should tighten
they should tighten 	I should be tightening
you should be tightening
he should be tightening
we should be tightening
you should be tightening
they should be tightening	I should have tightened
you should have tightened
he should have tightened
we should have tightened
you should have tightened
they should have tightened	I should have been tightening
you should have been tightening
he should have been tightening
we should have been tightening
you should have been tightening
they should have been tightening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should not tighten
you should not tighten
he should not tighten
we should not tighten
you should not tighten
they should not tighten 	I should not be tightening
you should not be tightening
he should not be tightening
we should not be tightening
you should not be tightening
they should not be tightening	I should not have tightened
you should not have tightened
he should not have tightened
we should not have tightened
you should not have tightened
they should not have tightened	I should not have been tightening
you should not have been tightening
he should not have been tightening
we should not have been tightening
you should not have been tightening
they should not have been tightening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I tighten?
should you tighten?
should he tighten?
should we tighten?
should you tighten?
should they tighten? 	should I be tightening?
should you be tightening?
should he be tightening?
should we be tightening?
should you be tightening?
should they be tightening? 	should I have tightened?
should you have tightened?
should he have tightened?
should we have tightened?
should you have tightened?
should they have tightened? 	should I have been tightening?
should you have been tightening?
should he have been tightening?
should we have been tightening?
should you have been tightening?
should they have been tightening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I not tighten?
should you not tighten?
should he not tighten?
should we not tighten?
should you not tighten?
should they not tighten? 	should I not be tightening?
should you not be tightening?
should he not be tightening?
should we not be tightening?
should you not be tightening?
should they not be tightening? 	should I not have tightened?
should you not have tightened?
should he not have tightened?
should we not have tightened?
should you not have tightened?
should they not have tightened? 	should I not have been tightening?
should you not have been tightening?
should he not have been tightening?
should we not have been tightening?
should you not have been tightening?
should they not have been tightening?