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 couldn't heckle you couldn't heckle she couldn't heckle we couldn't heckle you couldn't heckle they couldn't heckle
V-ing form
I couldn't be heckling you couldn't be heckling she couldn't be heckling we couldn't be heckling you couldn't be heckling they couldn't be heckling
Perfect
I couldn't have heckled you couldn't have heckled she couldn't have heckled we couldn't have heckled you couldn't have heckled they couldn't have heckled
V-ing perfect
I couldn't have been heckling you couldn't have been heckling she couldn't have been heckling we couldn't have been heckling you couldn't have been heckling they couldn't 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
couldn't I heckle? couldn't you heckle? couldn't she heckle? couldn't we heckle? couldn't you heckle? couldn't they heckle?
V-ing form
couldn't I be heckling? couldn't you be heckling? couldn't she be heckling? couldn't we be heckling? couldn't you be heckling? couldn't they be heckling?
Perfect
couldn't I have heckled? couldn't you have heckled? couldn't she have heckled? couldn't we have heckled? couldn't you have heckled? couldn't they have heckled?
V-ing perfect
couldn't I have been heckling? couldn't you have been heckling? couldn't she have been heckling? couldn't we have been heckling? couldn't you have been heckling? couldn't they have been heckling?