His research made a significant contribution to the scientific community.

His resistant attitude was a big problem for his parents.

I go to the bank every Friday.

My great-great-grandmother lived a very long life.

The sunlight poured into the room, making it very bright.

My schedule has changed.

This epidemic is spreading all over the world.

Japan's industry is famous worldwide.

I have been in a long-term association with him.

I couldn't understand his actions.