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