Large Cleaning and A Year End Party

Today, we performed a large cleaning of the end of the year.

I was so tired because we cleaned every nook and corner.

However, our room became clean and its environment is really comfortable.

After that, we held a year end party again.

It's the fourth time we had held the party this year.

We ate a hot pot cooking while watching a movie of Doraemon.
（Draemon is a Japanese animation character famous in Japan.）

When I watched the Draemon animation, I relived my childhood and sentimentalized.

Ah, I'm already an adult ....

今日は、研究室で年末の大掃除をしました。

部屋の隅から隅まで綺麗にしたので、とても疲れました。

しかし、我々の部屋は綺麗になり、本当に快適な環境になりました。

その後、忘年会がまた開かれました。

これで忘年会を開催するのは4回目です。

ドラえもんの映画を見ながら、皆で鍋を食べました。
（ドラえもんは、日本で有名な日本のアニメキャラクターです。）

ドラえもんを見ていると、子供の頃を思い出して、しんみりしました。

私ももう大人なんだなぁ・・・。

• Today, we performed a large cleaning of the end of the year.
• Today, we performed a large cleaning of the end of the year. (or: end of the year cleaning)

• I was so tired because we cleaned every nook and corner.
• I was so tired because we cleaned every nook and corner (or:cranny).

• Today, we performed a large cleaning of the end of the year.
• Today, we performed a large cleaning of for the end of the year.

• I was so tired because we cleaned every nook and corner.
• I was so tired because we cleaned every nook and corner.

  You can also use the expression "nook and cranny" instead of "nook and corner." However, this phrase is fairly informal. It can be used in daily conversation, but it should never be used in academic papers or very formal writing.

• However, our room became clean and its environment is really comfortable.
• However, our room became clean and its environment is it is now really comfortable.

  You don't need to write "its environment". It sounds more natural this way.

• After that, we held a year end party again.
• After that, we held a our annual year-end party. year end party again.

  When you write "year end party" you must write it with as "year-end party". You see the "-" symbol in "year-end"? This is important because it turns "year end" into an adjective which describes the noun "party". You should also write "our annual year-end party" because "annual" means "every year". You do not need to include "again" at the end of the sentence.

• It's the fourth time we had held the party this year.
• It's It was the fourth time we had held the party. this year.

  You should not write "this year" at the end of this sentence because it sounds like you have already had the party 4 times in 2014! You mean you had the party in 2011, 2012, 2013 and 2014, right? Not 4 times in the same year. I hope this makes sense! If not, please send me a message and I will explain further.

• We ate a hot pot cooking while watching a movie of Doraemon.
• We ate a hot pot hot-pot cooking while watching a the movie of Doraemon.

  Just as I explained before with "year-end party", you must use the "-" symbol here because "hot-pot" is an adjective which describes the noun "cooking". The word "cooking" is usually a verb but it can also be a noun. In this case, you used it correctly as a noun. Good job!

• （Draemon is a Japanese animation character famous in Japan.）
• （Draemon is a famous Japanese animation character. famous in Japan.）

  In English, it is usually better to put adjectives before nouns. This is not always true, but it makes your sentences easier to understand. As you become more proficient, you will learn how to put adjectives in different parts of English sentences.

• When I watched the Draemon animation, I relived my childhood and sentimentalized.
• When As I watched the Draemon animation, I relived my childhood and became sentimental. sentimentalized.

  "As" sounds more natural here because you are talking about a specific time you watched the movie. "When" sounds too general and makes it seem that you would always relive your childhood every time you watch Draemon. Also, "became sentimental" sounds more natural because "sentimentalized" is not usually used this way.

• Ah, I'm already an adult ....
• This sentence is perfect! No correction needed!

Good job! Your sentence structure is becoming more complex. As you learn more complex English, you will make mistakes. This is normal! You will become better over time (but you are already very good!).