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