I can snicker you can snicker he can snicker we can snicker you can snicker they can snicker
V-ing form
I can be snickering you can be snickering he can be snickering we can be snickering you can be snickering they can be snickering
Perfect
I can have snickered you can have snickered he can have snickered we can have snickered you can have snickered they can have snickered
V-ing perfect
I can have been snickering you can have been snickering he can have been snickering we can have been snickering you can have been snickering they can have been snickering
Negation
Simple form
I cannot snicker you cannot snicker he cannot snicker we cannot snicker you cannot snicker they cannot snicker
V-ing form
I cannot be snickering you cannot be snickering he cannot be snickering we cannot be snickering you cannot be snickering they cannot be snickering
Perfect
I cannot have snickered you cannot have snickered he cannot have snickered we cannot have snickered you cannot have snickered they cannot have snickered
V-ing perfect
I cannot have been snickering you cannot have been snickering he cannot have been snickering we cannot have been snickering you cannot have been snickering they cannot have been snickering
Interrogative form
Simple form
can I snicker? can you snicker? can he snicker? can we snicker? can you snicker? can they snicker?
V-ing form
can I be snickering? can you be snickering? can he be snickering? can we be snickering? can you be snickering? can they be snickering?
Perfect
can I have snickered? can you have snickered? can he have snickered? can we have snickered? can you have snickered? can they have snickered?
V-ing perfect
can I have been snickering? can you have been snickering? can he have been snickering? can we have been snickering? can you have been snickering? can they have been snickering?
Interro-negative form
Simple form
can I not snicker? can you not snicker? can he not snicker? can we not snicker? can you not snicker? can they not snicker?
V-ing form
can I not be snickering? can you not be snickering? can he not be snickering? can we not be snickering? can you not be snickering? can they not be snickering?
Perfect
can I not have snickered? can you not have snickered? can he not have snickered? can we not have snickered? can you not have snickered? can they not have snickered?
V-ing perfect
can I not have been snickering? can you not have been snickering? can he not have been snickering? can we not have been snickering? can you not have been snickering? can they not have been snickering?