I can cackle you can cackle he can cackle we can cackle you can cackle they can cackle
V-ing form
I can be cackling you can be cackling he can be cackling we can be cackling you can be cackling they can be cackling
Perfect
I can have cackled you can have cackled he can have cackled we can have cackled you can have cackled they can have cackled
V-ing perfect
I can have been cackling you can have been cackling he can have been cackling we can have been cackling you can have been cackling they can have been cackling
Negation
Simple form
I cannot cackle you cannot cackle he cannot cackle we cannot cackle you cannot cackle they cannot cackle
V-ing form
I cannot be cackling you cannot be cackling he cannot be cackling we cannot be cackling you cannot be cackling they cannot be cackling
Perfect
I cannot have cackled you cannot have cackled he cannot have cackled we cannot have cackled you cannot have cackled they cannot have cackled
V-ing perfect
I cannot have been cackling you cannot have been cackling he cannot have been cackling we cannot have been cackling you cannot have been cackling they cannot have been cackling
Interrogative form
Simple form
can I cackle? can you cackle? can he cackle? can we cackle? can you cackle? can they cackle?
V-ing form
can I be cackling? can you be cackling? can he be cackling? can we be cackling? can you be cackling? can they be cackling?
Perfect
can I have cackled? can you have cackled? can he have cackled? can we have cackled? can you have cackled? can they have cackled?
V-ing perfect
can I have been cackling? can you have been cackling? can he have been cackling? can we have been cackling? can you have been cackling? can they have been cackling?
Interro-negative form
Simple form
can I not cackle? can you not cackle? can he not cackle? can we not cackle? can you not cackle? can they not cackle?
V-ing form
can I not be cackling? can you not be cackling? can he not be cackling? can we not be cackling? can you not be cackling? can they not be cackling?
Perfect
can I not have cackled? can you not have cackled? can he not have cackled? can we not have cackled? can you not have cackled? can they not have cackled?
V-ing perfect
can I not have been cackling? can you not have been cackling? can he not have been cackling? can we not have been cackling? can you not have been cackling? can they not have been cackling?