English verb conjugation
COULD SHOW

Irregular verb: show - showed - shown

Affirmation

Simple form	V-ing form
I could show you could show he could show we could show you could show they could show	I could be showing you could be showing he could be showing we could be showing you could be showing they could be showing
Perfect	V-ing perfect
I could have shown you could have shown he could have shown we could have shown you could have shown they could have shown	I could have been showing you could have been showing he could have been showing we could have been showing you could have been showing they could have been showing

Negation

Simple form	V-ing form
I could not show you could not show he could not show we could not show you could not show they could not show	I could not be showing you could not be showing he could not be showing we could not be showing you could not be showing they could not be showing
Perfect	V-ing perfect
I could not have shown you could not have shown he could not have shown we could not have shown you could not have shown they could not have shown	I could not have been showing you could not have been showing he could not have been showing we could not have been showing you could not have been showing they could not have been showing

Interrogative form

Simple form	V-ing form
could I show? could you show? could he show? could we show? could you show? could they show?	could I be showing? could you be showing? could he be showing? could we be showing? could you be showing? could they be showing?
Perfect	V-ing perfect
could I have shown? could you have shown? could he have shown? could we have shown? could you have shown? could they have shown?	could I have been showing? could you have been showing? could he have been showing? could we have been showing? could you have been showing? could they have been showing?

Interro-negative form

Simple form	V-ing form
could I not show? could you not show? could he not show? could we not show? could you not show? could they not show?	could I not be showing? could you not be showing? could he not be showing? could we not be showing? could you not be showing? could they not be showing?
Perfect	V-ing perfect
could I not have shown? could you not have shown? could he not have shown? could we not have shown? could you not have shown? could they not have shown?	could I not have been showing? could you not have been showing? could he not have been showing? could we not have been showing? could you not have been showing? could they not have been showing?