When two sisters are talking firstone and secondone

first electricity is the mis5t important thing in our life
second  but lot of things we required in this 
first but it is helpful also 
Brother : Hey Di ! I am playing laptop you want to play?
Sister : You have been playing it since two hours. Now switch it off.
Brother : Why??
Sister : Cause you have been consuming a lot electricity than limited.
Brother : So what I am enjoying.
Sister :May you be enjoying but your next generation can't enjoy this. Remember you have to conserve some electricity for others too.
Brother : Ok di I am keeping the laptop and I will never ever leave the lights on before I go out.