find the mistakes in these sentences:
1_ if you have a mobile,will check if it is switched off.
2_people suffer a mass increase in prices.
3_I want to know how can advertising benefit the customer .
4_ The minister`s son was stolen to oblige his father to change the new law.
5_ Everyone is putting his umbrellas up .It wouldn`t have started to rain .
6_ Good and evil sides in human nature are always in peace.