He was able to recall the poem immediately.

It's difficult to remember new words.

It's difficult to remember his name.

I couldn't sleep because I could hear the howling of a dog in the middle of the night.

The dog howled in the middle of the night, and I couldn't sleep.

His threat is just a bluff.

之 is one of the ancient Chinese characters.

Zhi is my best friend.

Satoru is my best friend.

My mother woke me up.