He values his private life.

He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

The atomic number of helium is 2.

He can speak many languages.

She damaged her speech center due to a stroke and lost the ability to speak.

Do you know the origin of this word?

Metalinguistics is an important concept in linguistics.