Review of Mother Tongue

This post is to describe language differences between two generations and in formal and informal situation.
In China, where 5000 years' culture received deeply, use of language much differ between two generations. For me, I can use any words when talking to my friends. We young people prefer using fresh words which are created on the Internet and much newer. It is common that when we talk to our parents, our parents cannot understand what we say as the words they do not know. Besides, when I talk to my parents, I should show enough respect by culture. We are forbid actting like brother with parents.
When it comes to formal situation, I should use Putonghua. On top of that, I should not use imformal words from Internet. In formal situation, we also need to pay attention to our body language. On the other hand, we can use both formal language and informal language when having informal conversation.