I can snigger you can snigger he can snigger we can snigger you can snigger they can snigger
V-ing form
I can be sniggering you can be sniggering he can be sniggering we can be sniggering you can be sniggering they can be sniggering
Perfect
I can have sniggered you can have sniggered he can have sniggered we can have sniggered you can have sniggered they can have sniggered
V-ing perfect
I can have been sniggering you can have been sniggering he can have been sniggering we can have been sniggering you can have been sniggering they can have been sniggering
Negation
Simple form
I cannot snigger you cannot snigger he cannot snigger we cannot snigger you cannot snigger they cannot snigger
V-ing form
I cannot be sniggering you cannot be sniggering he cannot be sniggering we cannot be sniggering you cannot be sniggering they cannot be sniggering
Perfect
I cannot have sniggered you cannot have sniggered he cannot have sniggered we cannot have sniggered you cannot have sniggered they cannot have sniggered
V-ing perfect
I cannot have been sniggering you cannot have been sniggering he cannot have been sniggering we cannot have been sniggering you cannot have been sniggering they cannot have been sniggering
Interrogative form
Simple form
can I snigger? can you snigger? can he snigger? can we snigger? can you snigger? can they snigger?
V-ing form
can I be sniggering? can you be sniggering? can he be sniggering? can we be sniggering? can you be sniggering? can they be sniggering?
Perfect
can I have sniggered? can you have sniggered? can he have sniggered? can we have sniggered? can you have sniggered? can they have sniggered?
V-ing perfect
can I have been sniggering? can you have been sniggering? can he have been sniggering? can we have been sniggering? can you have been sniggering? can they have been sniggering?
Interro-negative form
Simple form
can I not snigger? can you not snigger? can he not snigger? can we not snigger? can you not snigger? can they not snigger?
V-ing form
can I not be sniggering? can you not be sniggering? can he not be sniggering? can we not be sniggering? can you not be sniggering? can they not be sniggering?
Perfect
can I not have sniggered? can you not have sniggered? can he not have sniggered? can we not have sniggered? can you not have sniggered? can they not have sniggered?
V-ing perfect
can I not have been sniggering? can you not have been sniggering? can he not have been sniggering? can we not have been sniggering? can you not have been sniggering? can they not have been sniggering?