Could someone help me with Chinese?

Hello Chinese friends!!!!

I wrote some more sentences in Chinese, I was wondering if they were correct? If anyone could help me I would really appreciate it. Zhongguo chayo!

Lesson 44 Introduce
 
请 介绍 你 自己。Please introduce yourself.
大家 自我 介绍 一下 。Everybody introduce themselves!
让我自 我 介绍 一下。Let me introduce myself.
我 也 来 介绍 一下! I would like to introduce myself as well!
让 我 介绍 一下 我的 经理。Let me introduce my manager (to you).
让 我 介绍 一下 我的 老师。Let me introduce my teacher (to you).
让 我 介绍一下 我的 朋友。 Let me introduce my friend (to you).
让 我 介绍一下 我的 好 朋友。Let me introduce my good friend (to you).
让 我 介绍一下 我的 老朋友。Let me introduce my old friend (to you).
 介绍一下 我的 校长。Let me introduce my principal (to you).
让 我 介绍一下 我  姐姐。Let me introduce my older sister (to you).
让 我 介绍一下 我 哥哥。Let me introduce my older brother (to you).
让 我 介绍一下 我 弟弟。Let me introduce my younger brother (to you).
让 我 介绍一下 我的 同学。Let me introduce my classmate (to you).
让 我 来 介绍一下, 这是 我的 父母。Allow me to introduce you, these are my parents.
让 我 来 介绍一下, 这是 我的 经理。Allow me to introduce you, this is my manager.
让 我 来 介绍一下, 这是 我的 老师。Allow me to introduce you, this is my teacher.
让 我 来 介绍一下, 这是 我的 朋友。Allow me to introduce you, this is my  friend.
让 我 来 介绍一下, 这是 我的 校长。Allow me to introduce you, this is my  principal.
让 我 来 介绍一下, 这是 我的 教师。 Allow me to introduce you, this is my professor.
让 我 来 介绍一下, 这是 我的老朋友。Allow me to introduce you, this is my old friend.
 

你很厉害了！you are  speak   chinese  so  good

But my English very  poor   can   you help me? » »

OK,you made it. All the sentences you wrote are right.
you’re very wonderful!I’m Chinese girl. Would you like to exchange languages with me?

很高兴你喜欢中文（hen gao xing ni xi huan zhong wen) -->   i am glad you like chinese.

如果你愿意的话可以加我，(ru guo ni yuan yi de hua ke yi jia wo ) 我的MSN 是 ———>if you want to talk with me , please add me , my MSN is

i am a chinese girl , my name is windy. i hope we can become friends. please send message to me!

your chinese is really good. there is no mistakes in your sentences. congratulations!

   Wonderful! I even dout you are a chinese ! woo , just a joke ,really very good.