A special event was held to celebrate his 100th birthday anniversary.

Sennenji is my best friend.

This fountain pen is my favorite.

We go on a family trip once a year.

Sannen is my best friend, and he is a very interesting person.

Kou Sennen is my best friend.

I was able to know the truth of the hundredth year.

There is a Citrus nobilis tree in my garden.

We are in a marriage with an age gap, but our love is deep.

The prepositional case plays an important role in English grammar.