Conjugação do verbo inglês
COULD UNDERPERFORM

Verbo regular: underperform - underperformed - underperformed

Afirmação

Forma simple	Forma com V-ing
I could underperform you could underperform he could underperform we could underperform you could underperform they could underperform	I could be underperforming you could be underperforming he could be underperforming we could be underperforming you could be underperforming they could be underperforming
Perfeito	Perfeito com V-ing
I could have underperformed you could have underperformed he could have underperformed we could have underperformed you could have underperformed they could have underperformed	I could have been underperforming you could have been underperforming he could have been underperforming we could have been underperforming you could have been underperforming they could have been underperforming

Negação

Forma simple	Forma com V-ing
I could not underperform you could not underperform he could not underperform we could not underperform you could not underperform they could not underperform	I could not be underperforming you could not be underperforming he could not be underperforming we could not be underperforming you could not be underperforming they could not be underperforming
Perfeito	Perfeito com V-ing
I could not have underperformed you could not have underperformed he could not have underperformed we could not have underperformed you could not have underperformed they could not have underperformed	I could not have been underperforming you could not have been underperforming he could not have been underperforming we could not have been underperforming you could not have been underperforming they could not have been underperforming

Forma interrogativa

Forma simple	Forma com V-ing
could I underperform? could you underperform? could he underperform? could we underperform? could you underperform? could they underperform?	could I be underperforming? could you be underperforming? could he be underperforming? could we be underperforming? could you be underperforming? could they be underperforming?
Perfeito	Perfeito com V-ing
could I have underperformed? could you have underperformed? could he have underperformed? could we have underperformed? could you have underperformed? could they have underperformed?	could I have been underperforming? could you have been underperforming? could he have been underperforming? could we have been underperforming? could you have been underperforming? could they have been underperforming?

Forma interro-Negação

Forma simple	Forma com V-ing
could I not underperform? could you not underperform? could he not underperform? could we not underperform? could you not underperform? could they not underperform?	could I not be underperforming? could you not be underperforming? could he not be underperforming? could we not be underperforming? could you not be underperforming? could they not be underperforming?
Perfeito	Perfeito com V-ing
could I not have underperformed? could you not have underperformed? could he not have underperformed? could we not have underperformed? could you not have underperformed? could they not have underperformed?	could I not have been underperforming? could you not have been underperforming? could he not have been underperforming? could we not have been underperforming? could you not have been underperforming? could they not have been underperforming?