I can sneer you can sneer he can sneer we can sneer you can sneer they can sneer
V-ing form
I can be sneering you can be sneering he can be sneering we can be sneering you can be sneering they can be sneering
Perfect
I can have sneered you can have sneered he can have sneered we can have sneered you can have sneered they can have sneered
V-ing perfect
I can have been sneering you can have been sneering he can have been sneering we can have been sneering you can have been sneering they can have been sneering
Negation
Simple form
I cannot sneer you cannot sneer he cannot sneer we cannot sneer you cannot sneer they cannot sneer
V-ing form
I cannot be sneering you cannot be sneering he cannot be sneering we cannot be sneering you cannot be sneering they cannot be sneering
Perfect
I cannot have sneered you cannot have sneered he cannot have sneered we cannot have sneered you cannot have sneered they cannot have sneered
V-ing perfect
I cannot have been sneering you cannot have been sneering he cannot have been sneering we cannot have been sneering you cannot have been sneering they cannot have been sneering
Interrogative form
Simple form
can I sneer? can you sneer? can he sneer? can we sneer? can you sneer? can they sneer?
V-ing form
can I be sneering? can you be sneering? can he be sneering? can we be sneering? can you be sneering? can they be sneering?
Perfect
can I have sneered? can you have sneered? can he have sneered? can we have sneered? can you have sneered? can they have sneered?
V-ing perfect
can I have been sneering? can you have been sneering? can he have been sneering? can we have been sneering? can you have been sneering? can they have been sneering?
Interro-negative form
Simple form
can I not sneer? can you not sneer? can he not sneer? can we not sneer? can you not sneer? can they not sneer?
V-ing form
can I not be sneering? can you not be sneering? can he not be sneering? can we not be sneering? can you not be sneering? can they not be sneering?
Perfect
can I not have sneered? can you not have sneered? can he not have sneered? can we not have sneered? can you not have sneered? can they not have sneered?
V-ing perfect
can I not have been sneering? can you not have been sneering? can he not have been sneering? can we not have been sneering? can you not have been sneering? can they not have been sneering?