Someone could correct my sentences please

We have (Can also say: "There is no model in place..") no model in place that allows us to live happily until the end of time.

How Why is it that no one wants to live in the city centers ("city" or even "middle of the city" sounds more nautral but city center is correct depending on where you are referring to when it seems to be the place to be to work and to be distracted?

Pay attention to fixed work time (I'm not sure what this means.) If you meant "amount of time spent at work, then say "Pay attention to the amount of time spent at work" because it does not take into account the variety of tasks to be performed.

Bartering may allow companies to provide goods and services to people who do not have money.

Employees are expected to be conscientious and versatile to evolve You can say: "advance in their careers" or "further their careers." (in their careers).

Great job, hope that helps!

Yup, it's a tongue-in-cheek phrase that is used pretty regularly to imply regret. Let's say you decided to go drinking one night and you end up drinking to the point where you black out and forget everything that you did that night. The following day, you meet your friend for breakfast and she says to you, "You smell like drinking and bad choices." Drinking generally causes you to make bad choices since your inhibitions are lowered. At the same time, usually we regret making bad decisions. Hence, it means: You smell like drinking and regret. Maybe you went up to some random girl at a bar and got rejected by her because you said something stupid. Maybe you went over your friend's house later and threw up in their kitchen. It's also a cheeky way of saying "you must have had fun last night." It's a pretty playful phrase that you could say to someone who looks hungover. Hope that helps!

I have owned many cups both in the past and in the present. Recently, I bought a new glass on the Internet. it's a transparent glass with a lot of pieces of  blossom petals and two beautiful white fawns. I like it because of its dreamlike colors and patterns. In order to protect it well, I bought a cup coat for it. (Although other people including myself will be unable to appreciate its beauty with the bottle coat on it, I still want to try my best to protect it.) - I think this fits the tone of the passage better. Though I find people including me will not appreciate its beauty as long as I put the bottlecoat on it, I still want to try my best to avoid its break. And that small thing made me start to think of realize something.

Just like the way in which I treat with my favorite cup (You can also say: "Just like how I treat my favorite cup"), I realized that there is a strong possibility that the reason why my parents force me to do things that I dislike is because they want to protect me from being harmed by the cruel world, to the point where they will use all of their strength and wisdom to do so. As a result, I have been wearing putting on an ugly but useful clothes to hug fewer avoid sadness, anger, and desperations and ,while finding more happiness from others and mine "from within" or "from. When I was young, it was really hard for me to understand my loved ones' purposes. I complained, lost my temper, used many awful ways to and expressed my dissatisfaction in many awful ways. to, and I forgot to use my heart to see this kind of love instead of using my eyes to see the superficiality. (I would rephrase this as follows: "I forgot that I needed to use my heart instead of my eyes to see this kind of love.") Even though my parents have made mistakes in expressing their true feelings, but most of those mistakes can be forgiven because I find nobody will treat me better than my parents and most people cannot break though the limitation of the ages. --> (I can't figure out what you're trying to say here) Luckily, I realized this truth from my precious glass. And I genuinely hope it's not too late.

Great job. It was a really difficult to make changes without detracting from your tone.

"Wait and Hope"

In The Count of Monte Cristo, the author Alexandre Dumas wrote down these inspiring (inspirational works here too.) words,
“There is neither happiness nor misery in the world; there is only the comparison of one state with another, nothing more. He who has felt the deepest grief is best able to experience supreme happiness. We must have felt what it is to die, Morrel, that we may appreciate the enjoyments of life.
" Live, then, and be happy, beloved children of my heart, and never forget, that until the day God will deign to reveal the future to man, all human wisdom is contained in these two words, 'Wait and Hope.”
Sometimes, these wise old sayings get blurred in memory. If you go back to them occasionally, a higher level of comprehension will surprise you. (This is correct depending on your tone; it kind of fits here. I would personally say "a higher level of comprehension awaits you.")
Life is not easy to everyone. (Again, this is not tecnically correct but it fits the personification of life being an entity.) I'd personally say, "Life is never easy." However, it won't be any harder if being you are patient, optimistic, and hardworking.

PS Be sorry even if don't want to say.

Great job.

I think the idiom: "put [x] into perspective," is what you're referring to. So when you say, "Talking to other people helped me put things into perspective," you're saying that you found a more accurate way of looking at yourself and your situation. Basically, let's say your parents bought you a new car in the color pink and it's really, really bothering you. If you talk to some other people, you might realize that not everyone can even afford a car to begin with. Then if you look back at your own situation, you could say, "talking to other people helped me put things into perspective," because getting a car from your parents for free in the first place is a luxury that not everyone can afford. So it's silly to get so upset about a car color when you received a free car to begin with. Hope that helps.

INFORMAL EMAIL.

HI SANDRA:
Thank you for you email. It was nice to hear from you .I'm very happy that you coming are coming to stay with me this weekend. Next weekend is Carnival in my town, and I am sure that you will enjoy it,. we can do many fun things ,besides since the weather is absolutely good (absolutely fantastic or absolutely amazing or just say great) like in the summer. How are you going to come here (going to get here or planning to get here), by car or by train? Both of them are good options, but if you don't want to drive, then the train is better because is more relaxing and only it takes about two hours from Sevilla to Cadiz,. while that the journey (The journey sounds kind of weird. I would say "Going by car" or "Traveling by car") by car is more expensive, because you have that pay for petrol, the tollbooth, and you can also find also might run into a traffic jam on the road and that's very ,which is really boring when you go alone.
I believe is better that you coming by train and I pick you up at the station if you are agree. (I would say this: I believe it is better to come by train and I can pick you up at the train station if you'd like.)

Looking forward to seeing you.
Best wishes.
May.

Great job. I added my way of saying certain things to fit your tone but you pretty much nailed it.

"Think globally, act locally" To put it simply, it means: Be open minded about learning about issues, cultures, and events around the world, and make use of this knowledge to improve your local area, hometown, or country. So for example, I could say I traveled to Japan and noticed how clean the streets were over there and how people generally picked up after themselves. In turn, when I am back here in America, I'll recycle, pick up trash when I see it, and try to improve the environment based on my experiences abroad. Again, it's more of an adage that emphasizes "learn from others, to improve yourself / your home." Hope that helps!