I can heckle you can heckle he can heckle we can heckle you can heckle they can heckle
V-ing form
I can be heckling you can be heckling he can be heckling we can be heckling you can be heckling they can be heckling
Perfect
I can have heckled you can have heckled he 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 he can have been heckling we can have been heckling you can have been heckling they can have been heckling
Negation
Simple form
I can't heckle you can't heckle he can't heckle we can't heckle you can't heckle they can't heckle
V-ing form
I can't be heckling you can't be heckling he can't be heckling we can't be heckling you can't be heckling they can't be heckling
Perfect
I can't have heckled you can't have heckled he can't have heckled we can't have heckled you can't have heckled they can't have heckled
V-ing perfect
I can't have been heckling you can't have been heckling he can't have been heckling we can't have been heckling you can't have been heckling they can't have been heckling
Interrogative form
Simple form
can I heckle? can you heckle? can he heckle? can we heckle? can you heckle? can they heckle?
V-ing form
can I be heckling? can you be heckling? can he be heckling? can we be heckling? can you be heckling? can they be heckling?
Perfect
can I have heckled? can you have heckled? can he 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 he have been heckling? can we have been heckling? can you have been heckling? can they have been heckling?
Interro-negative form
Simple form
can't I heckle? can't you heckle? can't he heckle? can't we heckle? can't you heckle? can't they heckle?
V-ing form
can't I be heckling? can't you be heckling? can't he be heckling? can't we be heckling? can't you be heckling? can't they be heckling?
Perfect
can't I have heckled? can't you have heckled? can't he have heckled? can't we have heckled? can't you have heckled? can't they have heckled?
V-ing perfect
can't I have been heckling? can't you have been heckling? can't he have been heckling? can't we have been heckling? can't you have been heckling? can't they have been heckling?