The hardest thing that i had to do.

Hi [이름]!

Happy Monday!

I still need you to concentrate on your spelling.

Other than that, your sentences were really good today.

You were able to follow the rules on verb tenses which was a challenge for you before.

I hope you would keep it up.^^

~~ Teacher Sharon

There were many things that I had to do.

>> Correct
But I would like to talk about a part-time work.

>> However, I would like to talk about a part- time job I had before.
When I was in a university, I had to earn my living cost.

>> When I was in college, I had to earn money to cover my living expenses.
It meant, I had to study and work at the same time.

>> It meant that I had to study and work at the same time.
It was quite hard, but I could learn many things.

> It was quite hard but I could learn many things.
Now,I have to get a job.

>> Correct 
I belive that I will do very well based on my part-time work experiences.

>> I believe that I will do very well based on my part-time work experiences.