English verb conjugation
COULD RETAG

Regular verb: retag - retaged - retaged

Affirmation

Simple form	V-ing form
I could retag you could retag he could retag we could retag you could retag they could retag	I could be retaging you could be retaging he could be retaging we could be retaging you could be retaging they could be retaging
Perfect	V-ing perfect
I could have retaged you could have retaged he could have retaged we could have retaged you could have retaged they could have retaged	I could have been retaging you could have been retaging he could have been retaging we could have been retaging you could have been retaging they could have been retaging

Negation

Simple form	V-ing form
I couldn't retag you couldn't retag he couldn't retag we couldn't retag you couldn't retag they couldn't retag	I couldn't be retaging you couldn't be retaging he couldn't be retaging we couldn't be retaging you couldn't be retaging they couldn't be retaging
Perfect	V-ing perfect
I couldn't have retaged you couldn't have retaged he couldn't have retaged we couldn't have retaged you couldn't have retaged they couldn't have retaged	I couldn't have been retaging you couldn't have been retaging he couldn't have been retaging we couldn't have been retaging you couldn't have been retaging they couldn't have been retaging

Interrogative form

Simple form	V-ing form
could I retag? could you retag? could he retag? could we retag? could you retag? could they retag?	could I be retaging? could you be retaging? could he be retaging? could we be retaging? could you be retaging? could they be retaging?
Perfect	V-ing perfect
could I have retaged? could you have retaged? could he have retaged? could we have retaged? could you have retaged? could they have retaged?	could I have been retaging? could you have been retaging? could he have been retaging? could we have been retaging? could you have been retaging? could they have been retaging?

Interro-negative form

Simple form	V-ing form
couldn't I retag? couldn't you retag? couldn't he retag? couldn't we retag? couldn't you retag? couldn't they retag?	couldn't I be retaging? couldn't you be retaging? couldn't he be retaging? couldn't we be retaging? couldn't you be retaging? couldn't they be retaging?
Perfect	V-ing perfect
couldn't I have retaged? couldn't you have retaged? couldn't he have retaged? couldn't we have retaged? couldn't you have retaged? couldn't they have retaged?	couldn't I have been retaging? couldn't you have been retaging? couldn't he have been retaging? couldn't we have been retaging? couldn't you have been retaging? couldn't they have been retaging?