This your book? - this book not my. my book in my bag. вставить am, is, are

Is this your book? - this book is not mine.  my book is in my bag

My son is a gamer. first he spent at the computer for about 30 minutes a day. he was very sociable and sports. he began to spend at the computer more and more time. now he spends at the computer for about 14 hours a day. about a year ago he became uncommunicative, reserved and nervous. then my wallet is missing a few notes, and i realized that he started to spend money on games. later i found that i lost my gold chain from her box and my credit card. i decided to start taking serious measures. we tried to talk to him, to limit time on the computer. but it did not help and we turned to the psychiatrist. but it also did not give good results. so we've come for help in your transfer.

Не  знаю как будет игроман,поэтому gamer my son of gamer. first he conducted at the computer about 30 minutes in a day. he was very sociable and sport. he began to conduct at the computer all more time. now he conducts at the computer about 14 clock in twenty-four hours. about year back he became unsociable, reserved and nervous. then for me a few notes disappeared from a purse, and i understood that he began to spend money on games. later i discovered that my gold chainlet from a small box and my credit card disappeared. i decided to begin to accept serious measures. to it we tried to talk with him, limit time of realization at the computer. but it did not help and we appealed to the psychiatrist. but it did not give good results too. therefore we came for help in your transmission.