English verb conjugation
COULD SAG

Regular verb: sag - sagged - sagged

Affirmation

Simple form	V-ing form
I could sag you could sag he could sag we could sag you could sag they could sag	I could be sagging you could be sagging he could be sagging we could be sagging you could be sagging they could be sagging
Perfect	V-ing perfect
I could have sagged you could have sagged he could have sagged we could have sagged you could have sagged they could have sagged	I could have been sagging you could have been sagging he could have been sagging we could have been sagging you could have been sagging they could have been sagging

Negation

Simple form	V-ing form
I could not sag you could not sag he could not sag we could not sag you could not sag they could not sag	I could not be sagging you could not be sagging he could not be sagging we could not be sagging you could not be sagging they could not be sagging
Perfect	V-ing perfect
I could not have sagged you could not have sagged he could not have sagged we could not have sagged you could not have sagged they could not have sagged	I could not have been sagging you could not have been sagging he could not have been sagging we could not have been sagging you could not have been sagging they could not have been sagging

Interrogative form

Simple form	V-ing form
could I sag? could you sag? could he sag? could we sag? could you sag? could they sag?	could I be sagging? could you be sagging? could he be sagging? could we be sagging? could you be sagging? could they be sagging?
Perfect	V-ing perfect
could I have sagged? could you have sagged? could he have sagged? could we have sagged? could you have sagged? could they have sagged?	could I have been sagging? could you have been sagging? could he have been sagging? could we have been sagging? could you have been sagging? could they have been sagging?

Interro-negative form

Simple form	V-ing form
could I not sag? could you not sag? could he not sag? could we not sag? could you not sag? could they not sag?	could I not be sagging? could you not be sagging? could he not be sagging? could we not be sagging? could you not be sagging? could they not be sagging?
Perfect	V-ing perfect
could I not have sagged? could you not have sagged? could he not have sagged? could we not have sagged? could you not have sagged? could they not have sagged?	could I not have been sagging? could you not have been sagging? could he not have been sagging? could we not have been sagging? could you not have been sagging? could they not have been sagging?