The です (desu) and ます (masu) forms are used to make polite sentences in Japanese. It is one of the first grammar points beginners learn and is essential for daily conversations.
ではありません (dewa arimasen) - (N5) - While both です (desu) and ではありません (dewa arimasen) are used in polite sentences, ではありません (dewa arimasen) is the negative form of です (desu).
でしょう (deshou) - (N5) - でしょう (deshou) is used to indicate conjecture or guess, while です (desu) is used to make straightforward statements.
てください (tekudasai) - (N5) - While both です (desu) and てください (tekudasai) are used to make polite requests, てください (tekudasai) is specifically used to ask someone to do something.
の (no) - (N5) - の (no) is a particle used for possession and modification, while です (desu) is used to make polite statements.