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