Excellent Chinese! I am really glad people like you really loving learning Chinese and have learn so hard and well. I am hosting a Chinese Corner in my university for foreigners teaching in local schools. I should introduce them to come and join everyone!

在中国学习的经历

从来我没想过我要学习汉语（我从来没想过我要学习汉语，only be careful with words order ），更没想到我来中国读书。学习汉语对我来说真的很难，最难的问题就是汉字和发音。因为每个汉字都要记住怎么写，怎么发音。再说我们的语言并没有声调, 所以学习汉语必须好好儿认真地(好好儿，认真 both mean with great attention or care, so you only need one of them)记住汉字和它的发音。 在中国如果你不会说汉语你肯定遇到不小的困难。比如你想买东西呀，问路呀，去吃饭 等等都要用汉语说。像我一样刚来北京的时候我一点汉语也不会，只能说你好，对不起，不客气。如果他们用汉语对我说，我什么都听不同(懂, i am sure you know this one, spelling mistakes)，说也不会说。这样的问题真让我很讨厌(真 and 很 both mean very or really, so you only need to use one of them)。后来在北京语言大学学汉语了一年以后(后来在北京语言大学学了一年汉语以后，the words order is VERY important)我感觉我的汉语水平越来越提高了（我感觉我的汉语水平提高了/我感觉我的汉语水平越来越高了  both are fine if used separately），也觉得学习汉语越学越有意思。现在我在外交学院读汉语。这里的各位老师对留学生非常热情，非常了解，态度也很好。他们经常鼓励我，帮助我。我希望在这里经过一段时间的努力，这些困难是可以克服的。

SO 1. words order is important 2. no hurry to use everything you have learnt so far, a summary of words or expressions of the same meaning would be very useful 3. you are good in Chinese

你好大家！请帮我把这些句子改好了。谢谢！

即便你没做错，你还得冷静一点。
Even though you didn't do anything wrong, you still need to calm down.

即便你没做错，你仍然需要冷静下来。

（Explaination: '还得' means 'you still need to' in some situations, like 'Even though you are good enough, you still need to do better....' [即是你很优秀，你还得更加努力], so it is usually used when you are trying to study harder, or to try again, which means more efforts to be made to make something happen. ’仍然需要‘ is more common and it won't be misleading.）

我们的生命虽然不短，我们还应该珍惜我们的时间。
Although our lifetime is not short, we still should cherish our time.

虽然我们的生命不短，我们仍然应该珍惜时间。
（Explaination: Well, yours is not wrong, this is just a better way to put it. '还应该' means  besides what you have done or what you have to done, you are supposed to do the followings. Here, the later part of the sentence wants to say something different from the former part. So, '仍然' is a good choice. last correction was made to avoid repeat. ） 

我有一个朋友， 她真是一位说唱行家。 他不仅会说唱，他还对它的历史把握了。
I have a friend, he really is a expert on rap. Not only can he rap, he also has a grasp on rap's history.

我有一个朋友，她真事一位说唱行家。她不仅会说唱，她还了解它（说唱）的历史。

（First, make sure you are talking about the same person. Here, '还' is used correctly to say something consistant with what has been said. As pointed out by other friends, 'has a grasp' could be clearly expressed by '了解' which should be followed by ‘说唱’.）

这里盖房子不是完全理想的，但是这里很安全，我们该想得开吧！
Building a house here isn't ideal, but it is very safe, we should be more open minded!
在这里盖房子并不理想，但是这里很安全，我们应该看开一点。

（'here' is not merely '这里'， especially when you want to do something or you are doing something HERE, it would be a good idea to add a 'prep', namely '在' in Chinese. 我想在这种一棵树。[I want to plant a tree here.] the rest is a little bit tricky and I will leave it to other people.）
谢谢大家的帮助！

You are welcome! (This one is natural and correct!)

First notebook entry: Introducing myself

我姓 Barton， 名叫James。我从纽卡斯尔来。我现在住在伦敦。我三十四岁。我在一个办公室工作。我的公司的名字是 Schroders.

再见！


Very good as a start! Enough to let me who you are, where are you living and what do you do. And I believe you can be better from suggestions for improvement.

Here are my suggestions: 

1. 从纽卡斯尔来。This expression is used when you come from a place which is near where you are now.   another better way to say where you come from is: 我来自纽卡斯尔。

2. 我在一个办公室工作。There is a strong sense of transflation from English, here you can use 我在办公室上班。 （I work in an office.）"一个" is not neccessary when you are not reffering to a specific office. 

3. 我的公司的名字是schroders. Well, this sounds like: take candy out of the box of blue, sometimes to avoid this sense of repeat, you can say：我公司的名称是schroders. or more simple: 我的公司是schroders. (howere, this sounds like you are running the company, but that's for another day.)

P.S. You are good enough to learn more and become better as long as you keep learning.