RISKY SPORT: Parachutnig

++ You must use a parachute.

+ Yuo should go with a partner.

- You shouldn't do by your own.

-- You mustn't do it alone if it's your first time.

This are the roules to practice parachuting. The most important are, you must use a parachute and you mustn't do it alone if it's your first time. Then you should go with a partner and you shouldn't do by you own.