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