The one of best way is to explain how the subject helps student after graduation.

Dear [이름],

Thank you for doing your homework.

Have a nice day ahead!

Teacher Sophia

Here are your corrections:

If students know how the subject is utilized after graduation, they might study hard and effectively.

>> If students know the importance of every subject after graduation, they can utilize the things that they have learned effectively.
The first reason is that it would be motivation for student to know how the subject is used in the real world and why the subject in needed.

>> Firstly, if the student knows the importance of every subject, they can be motivated to use them in the real world.

If the students don\'t know the purpose of studying the subject, they might think the subject is not necessary.

>> If the students don\'t know the relevance of the subjects, they might think the subjects are unnecessary to learn and study.

Also, their learning is an only study for a just study, which has not meaningful.

>> They are only learning and studying without any purpose.

I also think that informing the usage of the subject is teacher\'s role in order to help students understand the subject better.

>> I also think that informing the usage of the subjects is the teacher\'s role in order to help them to understand the subjects clearly.
The second reason is that if teacher tell student how the knowledge is used in society, they can study effectively.

>> Secondly, if the teacher tells the student the relevance of using the knowledge in the real world then the students will study effectively.

This is because they can focus on the particular part of the subject, which is more important in utilization.

>> This is because they can focus on the most important part of the subject and utilize it effectively.

Thorough this way, they can reduce the unnecessary time to study some part that is not frequently used.

>> On this way, they can use their time productively in focusing on the most important part of the subjects.
To sum up, explaining how the subject helps them after

>> To sum it up, explaining to students the importance of the subjects gives them a bird\'s eye view about the real world.