Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I should sniffer you should sniffer she should sniffer we should sniffer you should sniffer they should sniffer
V-ing form
I should be sniffering you should be sniffering she should be sniffering we should be sniffering you should be sniffering they should be sniffering
Perfect
I should have sniffered you should have sniffered she should have sniffered we should have sniffered you should have sniffered they should have sniffered
V-ing perfect
I should have been sniffering you should have been sniffering she should have been sniffering we should have been sniffering you should have been sniffering they should have been sniffering
Negation
Simple form
I should not sniffer you should not sniffer she should not sniffer we should not sniffer you should not sniffer they should not sniffer
V-ing form
I should not be sniffering you should not be sniffering she should not be sniffering we should not be sniffering you should not be sniffering they should not be sniffering
Perfect
I should not have sniffered you should not have sniffered she should not have sniffered we should not have sniffered you should not have sniffered they should not have sniffered
V-ing perfect
I should not have been sniffering you should not have been sniffering she should not have been sniffering we should not have been sniffering you should not have been sniffering they should not have been sniffering
Interrogative form
Simple form
should I sniffer? should you sniffer? should she sniffer? should we sniffer? should you sniffer? should they sniffer?
V-ing form
should I be sniffering? should you be sniffering? should she be sniffering? should we be sniffering? should you be sniffering? should they be sniffering?
Perfect
should I have sniffered? should you have sniffered? should she have sniffered? should we have sniffered? should you have sniffered? should they have sniffered?
V-ing perfect
should I have been sniffering? should you have been sniffering? should she have been sniffering? should we have been sniffering? should you have been sniffering? should they have been sniffering?
Interro-negative form
Simple form
should I not sniffer? should you not sniffer? should she not sniffer? should we not sniffer? should you not sniffer? should they not sniffer?
V-ing form
should I not be sniffering? should you not be sniffering? should she not be sniffering? should we not be sniffering? should you not be sniffering? should they not be sniffering?
Perfect
should I not have sniffered? should you not have sniffered? should she not have sniffered? should we not have sniffered? should you not have sniffered? should they not have sniffered?
V-ing perfect
should I not have been sniffering? should you not have been sniffering? should she not have been sniffering? should we not have been sniffering? should you not have been sniffering? should they not have been sniffering?