Daichi is my best friend.

He studies hard every day.

When a baby starts weaning, you begin to give them solid food little by little.

The baby has started to wean.

Day after day, he continued to strive to solve the problem.

This letter will be relayed.

This train is a direct service to Ye.

Thunder roared, and lightning ran.

Proto-Indo-European is considered the origin of many modern languages.

His success had a cause-and-effect relationship with his efforts.