English verb conjugation
COULD GRAY

Regular verb: gray - grayed - grayed

Affirmation

Simple form	V-ing form
I could gray you could gray he could gray we could gray you could gray they could gray	I could be graying you could be graying he could be graying we could be graying you could be graying they could be graying
Perfect	V-ing perfect
I could have grayed you could have grayed he could have grayed we could have grayed you could have grayed they could have grayed	I could have been graying you could have been graying he could have been graying we could have been graying you could have been graying they could have been graying

Negation

Simple form	V-ing form
I could not gray you could not gray he could not gray we could not gray you could not gray they could not gray	I could not be graying you could not be graying he could not be graying we could not be graying you could not be graying they could not be graying
Perfect	V-ing perfect
I could not have grayed you could not have grayed he could not have grayed we could not have grayed you could not have grayed they could not have grayed	I could not have been graying you could not have been graying he could not have been graying we could not have been graying you could not have been graying they could not have been graying

Interrogative form

Simple form	V-ing form
could I gray? could you gray? could he gray? could we gray? could you gray? could they gray?	could I be graying? could you be graying? could he be graying? could we be graying? could you be graying? could they be graying?
Perfect	V-ing perfect
could I have grayed? could you have grayed? could he have grayed? could we have grayed? could you have grayed? could they have grayed?	could I have been graying? could you have been graying? could he have been graying? could we have been graying? could you have been graying? could they have been graying?

Interro-negative form

Simple form	V-ing form
could I not gray? could you not gray? could he not gray? could we not gray? could you not gray? could they not gray?	could I not be graying? could you not be graying? could he not be graying? could we not be graying? could you not be graying? could they not be graying?
Perfect	V-ing perfect
could I not have grayed? could you not have grayed? could he not have grayed? could we not have grayed? could you not have grayed? could they not have grayed?	could I not have been graying? could you not have been graying? could he not have been graying? could we not have been graying? could you not have been graying? could they not have been graying?