Wow,Wow,Wow...

Wow...These days must be are fantastic! I chatted with nice persons in English. They are amazing ! Moreover, my English typing speed is more quickly has increased.
Wow...These days must be are so happy  enjoyable! I finished my working days.  Now ,i am enjoying myself on during the last 3 weeks of summer holiday. 

enjoyable 和 happy 都是 形容词

 但 enjoyable 形容 时间，事件 , happy 形容感情

Wow...These days must be are nice! There are so many persons people  who are all interested in learning languages.

They are so kind that they correct my poor essays. 

Wow...Oh, my days... (?)

# 你真乐观啊。我一点羡慕你。

Wow,Wow,Wow...

Wow...1) These days must be are fantastic. I chatted with some nice persons (我們通常不說persons，而說people。  不過，persons文法上沒有問題。） in English. They are amazing ! Moreover, my English typing speed is improving more quickly.

Wow...These days are so joyous must be so happy. I'm finished working for now, and am now enjoying myself during these last three weeks of my summer holiday. my working days , Now ,i am enjoying myself on the last 3weeks summer holiday.

Wow...These days are filled with encounters with so many nice people （我最近遇到了好多很親切的朋友）must be nice. There are so many persons who are all interested in learning languages. 2）They are so kind that they to correct my poorly written posts essay.

Wow...Oh, my days... (我不懂這個句子的意思。）

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1. Must be: 應該是。 說These days must be so happy/joyous/nice...有點不通。 論到自己的事情的時候，除非你不清楚你到底怎麼樣，或者你想要自誇自大，你最好避開用“I must be。。。"的句子。

I must be so hip!  我一定很帥！

有誰會那麼驕傲嗎？  哈哈。  ^__^.

不過，如果你是在跟你的朋友講他的近況，你可以那樣說。 你這樣，就等於是在猜測他最近如何。

Man, you must be so tired these days! 哇，你最近一定很累!

Yep, working as a dog haircutter and a dolphin trainer simultaneously isn't easy. 對啊，同時當作狗狗的理髮師和海豚的教練實在是不容易。

2. 文章是essay；你在Italki所寫的是posts.  還有，poor可以說是質量/品質不好，但是poor posts這樣寫很奇怪。 Poorly written posts （寫得不太好的投稿）可能比較恰當。