Are these sentences in Chinese correct?

Hello friends!

 I was wondering if anyone could help me with the following Chinese sentences, I would like to know if they are correct or not, as i make many mistakes.

 If anyone could help me I would really, really appreciate it!~

 Lesson 35 Why?

她 为什么 去? Why did she go?
他们 为什么 去? Why did they go?
她 为什么 去 火车站? Why is she going to the train station?
他们 为什么 去 火车站? Why are they going to the train station?
你 为什么 没 去过 上海?   Why haven’t you been to Shanghai?
你 为什么 想 学 中国历史?  Why would you like to learn about Chinese history?
你 为什么 要 买 汉语 课本 ? Why will you buy a Mandarin textbook?
你 为什么 要 买 英语 课本? Why will you buy an English-language textbook?
朱 小姐 为什么 学习 英语? Why does Ms. Zhu study English?
你 为什么 回 沈阳? Why will you back to Shenyang?
她为什么 今天  回 上海? Why is she going back to Shanghai today?
刘 今天 为什么 回 苏州。Why is Mr. Liu going back to Suzhou today?
他 为什么 回 国 了? Why did he return to his country?
你 为什么 那么 做？ Why did you do that?
他们 为什么 那么 做？Why did they do that?
朱 小姐 为什么 那么 做？Why did Ms. Zhu do that?
郑 先生为什么 那么 做？Why did Mr. Zheng do that?
你 为什么 不 喜欢  朱 小姐? Why don’t you like Ms. Zhu?
你 为什么 不 喜欢  美国? Why don’t you like the United States?
你 为什么 不 喜欢  韩国人? Why don’t you like South Korean people?
你 为什么 不 喜欢  学习 英语? Why don’t you like to study English?

Your sentences are correct. But You should pay attention to the future tense.When we use Chinese to express “future tense”, we should add “要、将要、打算”. Some of your sentences are not expressed exactly. e.g.:Why will you back to Shenyang? 你为什么要回沈阳？

你 为什么 不 喜欢  学习 英语? Why don’t you like to study English?

  You should say  why don't you like studying English?

to study  in chinese means: you want to …do sth.

in your sentence it means 你为什么不喜欢去学习英语！it more concern about your action rather than your emotion!

Nice one!

These days loads of people are studying Mandarin, even our PM knows it quite well :)

  why are they going to the train station? 他们 为什么 要 去火车站

  why is she going to the train station? 她 为什么 要 去火车站？

  why will you buy a mandarin textbook?你 为什么 要买 普通话课本？

  why will you buy a english-language textbook?你 为什么 要买 一本英语课本？（“要”emphasize the future state"will")

  why will you back to shenyang?你 为什么 要回 沈阳？

  why is she going back to shanghai today?她 为什么 今天 要回上海？（is going to="要“）

  why is mr liu going back to suzhou today? 刘先生 为什么 今天 要回苏州？

  ok,that's all i could find your error in your words,wish u learn chinese better&better

Thank you everyone for your help!!!

most of them are correct .