if you want to lose weight easily, go to the gym
if you want to be a good friend, be responsible
if you want to get better in English, don't be lazy
if you want to tell a lie without getting caught, don't tell anything
if you want to download music from the Internet, click download
if you want to travel with little money, hitchhike
if you don't want to be robbed in transport, be attentive.
if you want to keep safe in a thunderstorm, stay at home
if you want to surprise your mum, give her a present