I could cry you could cry he could cry we could cry you could cry they could cry
V-ing form
I could be crying you could be crying he could be crying we could be crying you could be crying they could be crying
Perfect
I could have cried you could have cried he could have cried we could have cried you could have cried they could have cried
V-ing perfect
I could have been crying you could have been crying he could have been crying we could have been crying you could have been crying they could have been crying
Negation
Simple form
I could not cry you could not cry he could not cry we could not cry you could not cry they could not cry
V-ing form
I could not be crying you could not be crying he could not be crying we could not be crying you could not be crying they could not be crying
Perfect
I could not have cried you could not have cried he could not have cried we could not have cried you could not have cried they could not have cried
V-ing perfect
I could not have been crying you could not have been crying he could not have been crying we could not have been crying you could not have been crying they could not have been crying
Interrogative form
Simple form
could I cry? could you cry? could he cry? could we cry? could you cry? could they cry?
V-ing form
could I be crying? could you be crying? could he be crying? could we be crying? could you be crying? could they be crying?
Perfect
could I have cried? could you have cried? could he have cried? could we have cried? could you have cried? could they have cried?
V-ing perfect
could I have been crying? could you have been crying? could he have been crying? could we have been crying? could you have been crying? could they have been crying?
Interro-negative form
Simple form
could I not cry? could you not cry? could he not cry? could we not cry? could you not cry? could they not cry?
V-ing form
could I not be crying? could you not be crying? could he not be crying? could we not be crying? could you not be crying? could they not be crying?
Perfect
could I not have cried? could you not have cried? could he not have cried? could we not have cried? could you not have cried? could they not have cried?
V-ing perfect
could I not have been crying? could you not have been crying? could he not have been crying? could we not have been crying? could you not have been crying? could they not have been crying?