Describe a person you know who has an important job

Ok, well it was actually quite difficult choosing whom to talk about, because, I mean, if you think about it, everyone’s job is important in some way or another. But in the end I’ve decided to talk about Mrs. Li,  and she is a teacher.
Mrs. Li is a teacher who taught Chinese when I was in my primary school. She was a kindhearted woman with short gray hair because she was about sixty. She usually wore dark-colored clothes and wear glasses. She always spoke slowly but she was very popular in our class.
Why I found being a teacher is an important job because teachers is not only teach us knowledge, but also good manners. In addition, I think education is the foundation of our society, and teachers are the foundation of education. Mrs. Li always told us to be useful in society. Her Chinese lessons were always very good; because of them, I am also very good at it now.
So I think not only are teachers an essential part of our society, but also it is an important job.

Good job! :)

Some notes:

1) Since you're describing Mrs. Li in the past, you have to use to the past tense to describe her.

2) In English punctuation, there is always a space after periods and commas.

3) When talking about a group in general, use the plural form. For example, "teachers"

If you have any questions about the corrections I made, feel free to ask me.

继续加油吧。:)