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これは本です。
This is a book.
A polite form of the copula used to state facts or describe things in a formal or respectful manner.
これは私の車です。
This is my car.
彼は学生です。
He is a student.
Used in formal contexts, such as business, customer service, or when speaking to someone of higher status.
Use 'です' in formal situations, such as business meetings or when speaking to elders or superiors.
Always use 'です' in formal contexts to maintain politeness and respect.
Derived from the contraction of ですます調 (desu-masu style), a polite speech style in Japanese.
Used in formal speech and writing. The plain form 'だ' is used in casual speech.