I could cast you could cast she could cast we could cast you could cast they could cast
V-ing form
I could be casting you could be casting she could be casting we could be casting you could be casting they could be casting
Perfect
I could have cast you could have cast she could have cast we could have cast you could have cast they could have cast
V-ing perfect
I could have been casting you could have been casting she could have been casting we could have been casting you could have been casting they could have been casting
Negation
Simple form
I could not cast you could not cast she could not cast we could not cast you could not cast they could not cast
V-ing form
I could not be casting you could not be casting she could not be casting we could not be casting you could not be casting they could not be casting
Perfect
I could not have cast you could not have cast she could not have cast we could not have cast you could not have cast they could not have cast
V-ing perfect
I could not have been casting you could not have been casting she could not have been casting we could not have been casting you could not have been casting they could not have been casting
Interrogative form
Simple form
could I cast? could you cast? could she cast? could we cast? could you cast? could they cast?
V-ing form
could I be casting? could you be casting? could she be casting? could we be casting? could you be casting? could they be casting?
Perfect
could I have cast? could you have cast? could she have cast? could we have cast? could you have cast? could they have cast?
V-ing perfect
could I have been casting? could you have been casting? could she have been casting? could we have been casting? could you have been casting? could they have been casting?
Interro-negative form
Simple form
could I not cast? could you not cast? could she not cast? could we not cast? could you not cast? could they not cast?
V-ing form
could I not be casting? could you not be casting? could she not be casting? could we not be casting? could you not be casting? could they not be casting?
Perfect
could I not have cast? could you not have cast? could she not have cast? could we not have cast? could you not have cast? could they not have cast?
V-ing perfect
could I not have been casting? could you not have been casting? could she not have been casting? could we not have been casting? could you not have been casting? could they not have been casting?