Mr. Hakkaku is my best friend.

I explained the dative case to him.

In Latin, the ablative case is mainly used to indicate direction, origin, and separation.

His life has experienced a major alteration.

He decided to alter the plan.

This beautiful seahorse is one of the most mysterious creatures in the sea.

In Japanese grammar, the adnominal case is the form where nouns or pronouns modify other nouns.

In this right triangle, since one angle is 30 degrees, its complementary angle is 60 degrees.

My grandfather used to raise domestic fowls.

He wrote a letter and sent it to his friend.