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