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Dear [이름],

Greetings! ^.^

Happy Thursday! ^^

I think I already told you before that I don\'t really plan for the weekends.

It is better for me to follow others plan.

It is because, when no one will ask me to go out, I will just stay home and rest.

I really think my body needs rest.

Nowadays, I work from 10 am to 11 pm.

I think I am somehow torturing myself from working too much.

So, I really think that I don\'t need to plan for anything for now.

By the way, I know very well that you will enjoy a fantastic time with your friend.

That\'s all for now! ^^

See you tomorrow! ^^,

... Teacher Paula ... ^.~

Dear Teacher Paula,
>> CORRECT!

Happy Thursday!
>> CORRECT!

It is approaching our wonderful weekend.
>> It is approaching, our wonderful weekend. (IT is about OUR WONDERFUL WEEKEND, right? So, it is better to put a comma after APPROACHING.)

>> OR: Our wonderful weekend is approaching.

Do you make your plan for this coming weekend?
>> Have you made your plan for this coming weekend? (When you ask about someone\'s plan for the future, it is better to use verbs on SIMPLE PAST or PRESENT PERFECT forms.)

>> OR: Did you make your plan for this coming weekend?

In my case, I am going to meet one of my elementary school friends.
>> CORRECT!

She returned from abroad two months ago, and she will come here from Busan to attend one of her relatives\' wedding.
>> She returned from abroad two months ago, and she will come here from Busan to attend one of her relatives\' weddings. (WEDDING should be WEDDINGS.)

It\'s been a long time since we met.
>> CORRECT!

>> BETTER: It\'s been a long time since we last met.

I think there are lots of stories to talk, and we might lose track of our time.
>> CORRECT!

See you very soon.
>> CORRECT!

>> OR: See you very soon!

*Essay

To keep water clean, we should practice from small things in our daily lives.
>> CORRECT!

First, when we brush teeth, we shouldn\'t leave the faucet running.
>> First, when we brush our teeth, we shouldn\'t leave the faucet running. (Whose teeth are you going to brush? Be specific with this one.)

In my case, I use a cup, and only one cup is enough for brushing.
>> CORRECT!

Of course, that is only for gargling, to wash the toothbrush, I leave the tap running for a short time.
>> Of course, this is only for gargling. To wash the toothbrush, I leave the tab running for a short time. (They are two ideas that are not connected by a conjunction, so it is better to make them into two sentences or put a semi-colon.)

>> OR:  Of course, this is only for gargling; to wash the toothbrush, I leave the tab running for a short time.

Second, we should do a laundry at once.
>> CORRECT!

Today\'s households almost have their washing machines.
>> CORRECT!

It already has become an indispensable part of our lives, and most people use it frequently.
>> CORRECT!

To save water, I think it is reasonable to use it once a week.
>> CORRECT!

>> OR: To save water, I think it is reasonable to use it once a week for laundry.

If the number of uses of that is lower, we will be able to save water enough.
>> If the number of uses of that is lower, we will be able to save enough water. (What do you mean about your sentence?)

>> If the number of uses of that is lower, we will be able to save water enough for us to use in the future.

Third, we shouldn\'t throw used oil in the sink.
>> CORRECT!

Whenever we cook, we face a matter about how to dispose of it.
>> Whenever we cook, we face a matter about how to dispose it. (PATTERN: to dispose something)

>> OR: Whenever we cook, we face a matter about the disposal of it.

In this case, we can clean it away with some kitchen papers.
>> CORRECT!

Apart from those, we have lots of methods to keep water.
>> CORRECT!

I think it seems also good to take some time to think about how to keep it ourselves.

>> I think it seems also good to take some time to think about how to keep it by ourselves. (I think you forgot to put BY before OURSELVES.)