English verb conjugation
COULD ZAG

Regular verb: zag - zaged - zaged

Affirmation

Simple form	V-ing form
I could zag you could zag he could zag we could zag you could zag they could zag	I could be zaging you could be zaging he could be zaging we could be zaging you could be zaging they could be zaging
Perfect	V-ing perfect
I could have zaged you could have zaged he could have zaged we could have zaged you could have zaged they could have zaged	I could have been zaging you could have been zaging he could have been zaging we could have been zaging you could have been zaging they could have been zaging

Negation

Simple form	V-ing form
I couldn't zag you couldn't zag he couldn't zag we couldn't zag you couldn't zag they couldn't zag	I couldn't be zaging you couldn't be zaging he couldn't be zaging we couldn't be zaging you couldn't be zaging they couldn't be zaging
Perfect	V-ing perfect
I couldn't have zaged you couldn't have zaged he couldn't have zaged we couldn't have zaged you couldn't have zaged they couldn't have zaged	I couldn't have been zaging you couldn't have been zaging he couldn't have been zaging we couldn't have been zaging you couldn't have been zaging they couldn't have been zaging

Interrogative form

Simple form	V-ing form
could I zag? could you zag? could he zag? could we zag? could you zag? could they zag?	could I be zaging? could you be zaging? could he be zaging? could we be zaging? could you be zaging? could they be zaging?
Perfect	V-ing perfect
could I have zaged? could you have zaged? could he have zaged? could we have zaged? could you have zaged? could they have zaged?	could I have been zaging? could you have been zaging? could he have been zaging? could we have been zaging? could you have been zaging? could they have been zaging?

Interro-negative form

Simple form	V-ing form
couldn't I zag? couldn't you zag? couldn't he zag? couldn't we zag? couldn't you zag? couldn't they zag?	couldn't I be zaging? couldn't you be zaging? couldn't he be zaging? couldn't we be zaging? couldn't you be zaging? couldn't they be zaging?
Perfect	V-ing perfect
couldn't I have zaged? couldn't you have zaged? couldn't he have zaged? couldn't we have zaged? couldn't you have zaged? couldn't they have zaged?	couldn't I have been zaging? couldn't you have been zaging? couldn't he have been zaging? couldn't we have been zaging? couldn't you have been zaging? couldn't they have been zaging?