请各位英语高手帮我看看以下三句话有没有什么语法问题

请各位英语高手帮我看看以下三句话有没有什么语法问题
1、If you are too shy to enjoy parties or you can 't behave well ,you can talk with some friendly people to be a little outgoing .2,Before big parties ,you can eat some fruits and vegetables and drink lots of water to not to get pimples and you'll be much beautiful .3,Unless you take a long walk before going to bed ,you can't sleep well ,and the next day ,you will be too tired to pass the big exam .句子不难,速求