Thank you very very much, Jeff! :)

我不去了中国。(I have not been to China)——我没去过中国。 我需要这.好吗! (I need this. Please!)——我需要这个(or 我要这个)，（it's hard to translate "please" to Chinese in this sentence，in spoken Chinese，we would say 好吗 or 可以吗 or 行吗 or 谢谢）！