It's true that I wouldn't use 'wanna' in a business email or in a professional/formal context, and I agree that it's important for English language learners to know that. But 'wanna' is very much a part of written vernacular speech in English--not the kind you'd find in a dictionary, but the kind that young people especially use to communicate (over text, whatsapp, emails, etc).

I think it's a huge advantage for English language learners to be able to 'code switch' in their writing between formal and informal speech depending on context; it sounds much more natural. To me, the ability to switch between both 'formally/informally spoken' and 'formally/informally written' English shows a higher level of nuance and mastery of the language. Standard North American English is important to learn correctly, of course, but English has so many wonderful varieties and dialects, all of which have their own internal linguistic rules and histories!

P.s. since someone mentioned 'tryna' earlier, I thought I'd link a linguistics video on African American Vernacular English, a dialect of North American Standard English. 'Tryna' is originally part of this dialect, but of course there is code-switching and dialectal flexibility between Standard and AAVE. I found it really informative. Enjoy! <a href="https://www.youtube.com/watch?v=UZpCdI6ZKU4" rel="noopener noreferrer" target="_blank">https://www.youtube.com/watch?v=UZpCdI6ZKU4</a>

Subjunctive future

A 4-day holiday will start <s>since</s> on the 23rd of this July. [more natural: 'this July 23rd.']

I was wondering for what reason those holidays had been formed. [more natural: 'what we were celebrating on these holidays'

If COVID-19 were not a pandemic [More natural: 'If the pandemic wasn't happening,'], the Olympics would have been held in Tokyo during the holidays.

During that holiday we may be able to enjoy good value trips thanks to an economic recovery campaign.

However, should the infective disease form spread, I may not want to go on trips.

Hi, could you check these sentences, please?

1) I insist that his dog <s>back off from</s> get off of my lawn immediately. [Note: you can also tell someone to back off, but that's more often a general request to be left alone rather than a demand that they get away from a specific place. You could also say 'back up off of my lawn', but that's very colloquial.]

2) If you didn't back me up I would<s> have big troubles (</s>either: 'would have been in big trouble' or 'would have had seriousl problems'). So I don't even know how I can express my gratitude.

3) I didn't see the level of diligence that I expected from him.

4) He's too fussy to live in nature in tents for several days in the row. (or should I use picky instead of fussy?) [Either is fine! Fussy sounds slightly better to me here, but matter of taste.]

5) I felt a strong exasperation [more natural: 'I felt really exasperated'] after coming home from work, so I asked that no one bother me till tomorrow.

6) One of his most valuable qualities was integrity.

7) I want to acquire new skills in order to become a better employee.

My composition

As<s> it</s> depicted vividly in this illustration, a dazzling variety of literary works, from Chinese to Western, were displayed in a <s>culture</s> <s>hotpot</s> [you might mean "a cultural melting pot"--I'm not familiar with the phrase 'culture hotpot'].The original combination of divergent cultures makes the <s>hotpot </s> pot all the more tasty and captivating, notes the writer.

To the best of my knowledge, in a time <s>of cultural diversity being emphasized so much </s>when cultural diversity is emphasized so much, <s>culture hotpot</s> this cultural melting pot is a triumph of the epoch. For one thing, tens of thousands of students derived enormous satisfaction and knowledge from a wide range of literature. Not only do we have <s>a proficient</s> command of our own cultures, but we can also have a better understanding of the world. For another, literature represents the accumulated wisdom <s>down through</s> of the ages, and they are the common treasure of all mankind. Mixing together the essence of heritages from all over the world will undoubtedly boost the circulation [Note: unsure what you mean by this phrase. Maybe 'widen the horizons'?] of human civilization.

Applying for a post

<s>Dear Dave Spurling!</s> Dear Mr. Spurling,

I would like to apply for the Student Assistant position. <s>post of Student Assistant</s>. <s>My name is Valentina.</s> [Note: you say your name at the end of the letter, so this can be deleted :)] I <s>definitely can help </s>am qualified to help young people <s>to</s> learn new skills in the countryside because I was born and grew up in a village. I can teach students how to <s style="background-color: rgb(255, 194, 102);">do gardening</s> garden and take care of domestic animals. I can also cook, swim and play sports. <s>I can not </s>Although I'm not much of a singer <s>and</s> or dancer, <s>but</s> I like listening to music and enjoy many <s style="background-color: rgb(255, 194, 102);">I have a big collection of music of</s> different styles and genres. [Maybe add a sentence here about you how look forward to helping young people learn and grow in a rural environment, just to make it clear that you would be a good worker.]

Unfortunately, <s>I can not attach to the job in July </s> I'm not available to start work in July because I need to finish a university project. Can I start on 1 August? I can also to work an extra week at the end of the camp if you need me.

Best regards,

Valentina [Last Name]