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 couldn't sag you couldn't sag he couldn't sag we couldn't sag you couldn't sag they couldn't sag	I couldn't be sagging you couldn't be sagging he couldn't be sagging we couldn't be sagging you couldn't be sagging they couldn't be sagging
Perfect	V-ing perfect
I couldn't have sagged you couldn't have sagged he couldn't have sagged we couldn't have sagged you couldn't have sagged they couldn't have sagged	I couldn't have been sagging you couldn't have been sagging he couldn't have been sagging we couldn't have been sagging you couldn't have been sagging they couldn't 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
couldn't I sag? couldn't you sag? couldn't he sag? couldn't we sag? couldn't you sag? couldn't they sag?	couldn't I be sagging? couldn't you be sagging? couldn't he be sagging? couldn't we be sagging? couldn't you be sagging? couldn't they be sagging?
Perfect	V-ing perfect
couldn't I have sagged? couldn't you have sagged? couldn't he have sagged? couldn't we have sagged? couldn't you have sagged? couldn't they have sagged?	couldn't I have been sagging? couldn't you have been sagging? couldn't he have been sagging? couldn't we have been sagging? couldn't you have been sagging? couldn't they have been sagging?