In order:
Yes, in the duet and team events.
he has won the swimming events like team relay etc.
There are 34 swimming events out of the 46 in Aquatics. There are also 8 Diving events and 2 events each for Synchronized swimming and Water polo
New events in the 2008 Games include BMX cycling, women's 3000 meter steeplechase, marathon (10 km) swimming, and team events in table tennis.
There are 17 Men'a events and 17 Women's events for Swimming
Water polo, Basketball, Field hockey, Football, Indoor Volleyball, & Handball are all team Sports without individual events included. There are also other team events in Gymnastics, Equestrian, & Cycling. The Sports of Swimming and Athletes have relays, Rowing and Canoeing have events with 2 or more individuals. Badminton and Tennis have doubles
Overall, 9 new events were held, which included 2 from the new cycling discipline of BMX. Women competed in the 3000 m steeplechase for the first time. In addition, marathon open water swimming events for men and women, over the distance of 10 kilometres, were added to the swimming discipline. Team events (men and women) in table tennis replaced the doubles events. In fencing, women's team foil and women's team Sabre replaced men's team foil and women's team épée.
ian thorpe was a wold class swimming champion who was in the mens relay team and is gold medalist in some olympic events
There will be 300 events in 26 sports at the 2012 Olympics.
The International Olympic Committee defines aquatic events as swimming, synchronized swimming, diving, and water polo.
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There were 19 NOC that medaled in swimming events. 166 of the 204 NOCs had athletes in the 34 swimming events see related link