I could cry you could cry she could cry we could cry you could cry they could cry
V-ing form
I could be crying you could be crying she could be crying we could be crying you could be crying they could be crying
Perfect
I could have cried you could have cried she 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 she could have been crying we could have been crying you could have been crying they could have been crying
Negation
Simple form
I couldn't cry you couldn't cry she couldn't cry we couldn't cry you couldn't cry they couldn't cry
V-ing form
I couldn't be crying you couldn't be crying she couldn't be crying we couldn't be crying you couldn't be crying they couldn't be crying
Perfect
I couldn't have cried you couldn't have cried she couldn't have cried we couldn't have cried you couldn't have cried they couldn't have cried
V-ing perfect
I couldn't have been crying you couldn't have been crying she couldn't have been crying we couldn't have been crying you couldn't have been crying they couldn't have been crying
Interrogative form
Simple form
could I cry? could you cry? could she cry? could we cry? could you cry? could they cry?
V-ing form
could I be crying? could you be crying? could she be crying? could we be crying? could you be crying? could they be crying?
Perfect
could I have cried? could you have cried? could she 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 she have been crying? could we have been crying? could you have been crying? could they have been crying?
Interro-negative form
Simple form
couldn't I cry? couldn't you cry? couldn't she cry? couldn't we cry? couldn't you cry? couldn't they cry?
V-ing form
couldn't I be crying? couldn't you be crying? couldn't she be crying? couldn't we be crying? couldn't you be crying? couldn't they be crying?
Perfect
couldn't I have cried? couldn't you have cried? couldn't she have cried? couldn't we have cried? couldn't you have cried? couldn't they have cried?
V-ing perfect
couldn't I have been crying? couldn't you have been crying? couldn't she have been crying? couldn't we have been crying? couldn't you have been crying? couldn't they have been crying?