She is my sworn younger sister, and we are always together.

Raven is my best friend.

Literary history is like a mirror reflecting the changes in human thoughts and emotions.

He earned a Bachelor of Arts degree at the University of Tokyo.

New business opportunities have arisen due to market segmentation.

We need to subdivide this project.

I go to the local library every week.

I have been corresponding with her for many years.

I correspond with her every day.

I learned the method of factorization in math class.