1) Did you meet Irene Adler five years ago? I didn't meet Irene Adler five years ago.2) Are you sure this case is interesting? I am not sure this case is interesting. 3) Is it a real mystery? It isn't a real mystery.4) Is such paper strong and stiff? Such paper isn't strong and stiff. 5) Did your visitor look at you with surprise? Our visitor didn't looke at us with surprise.6) Are you going to marry? I am not going to marry.7) Can you find me at my place? I can't find you in your place.