在坡特兰波特兰出差

我这周在坡特兰波特兰拍一些访谈的视频，看望几个人，还计划（是计划会拍还是正在策划？）一部学言语语言的记录片。十一月我会去上海，会在中国再待几个月继续学习，和拍摄。

在坡特兰出差

  我这周在坡特兰拍一些关于访谈的视频，看望几个人（朋友），还计划看学语言的记录片。十一月我会去上海，会在中国那里（cause you said you will go to Shanghai, so to make it more logical, it's better just say "i will stay THERE for some months"）再待几个月继续学习，、（“ctrl”+"\" we use this punctuation when listing a few things, for example, "I like banana, apple and grape.我喜欢香蕉、苹果和葡萄。"）拍摄。

"a" correction and comment

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I  can see you have learnt Mandarin for some time and you can deal with most of the grammar and the use a correct word in the sentence. However, your title is "the business trip in 波特兰 " with half of the content is about another trip in China, so, I suggest you to write some interesting stories about your businesss trip there so as to make the writing focused:) If you got any confusion of my correction please contact me.