And, sophy, it's not so easy to communicate with people from different culture. 
I think what we can do is speak more and try our best to let them know what we're thinking. 
Now I only know do this and don't know if it is useful. 
But ,everybody——no matter from China or other countries——has a kind heart. I always believe that.^^ 
So, come on! Let's working hard together~!

Now I know, everything begins hard.
But when you put your heart into what you're doing and work hard, you can achieve something. 
Thank you all for your encouragement, I won't lose my hope. 
And I will try my best to make my opinion clearly when communicating with others.

1. My name is.. ---- wǒ dē míng zì shì... 我的名字是... 2. I come from.. ----wǒ lái zì... 我来自.... 3. Where do you live? ----nǐ zhù zài nǎ lǐ ? 你住在哪里？ 4. I live in.. ----wǒ zhù zài... 我住在... 5. I think so ---wǎ rèn wéi shì zhè yàng/ wǎ jué dé shì zhè yàng. 我认为是这样。/我觉得是这样。 6. Great! ---bàng jí le! 棒极了！ 7. My mother is ---wǎ dē mǔ qīn shì... 我的母亲是... 8. My father is ---wǒ dē fù qīn shì ... 我的父亲是... 9. My hobby is ---wǒ dē ài hào shì ... 我的爱好是... 10. Do you like football? ---nǐ xǐ huān zú qíu mā ? 你喜欢足球吗？

Thank you.......

《德语语法大全》（上、下册）
我们老师推荐的这本，非常好，讲解很详细。

"what's up?" means 怎么样？It's just like "How is everything going?" or "Hello!". And 汉语是汉语怎么写? is not a wrong sentence. It should be "汉语是汉语"怎么写？ Just means how to write this sentence:"Chinese is Chinese". Hmm...I just think that.