Are you ...? / Is it ...? — Yes, that’s right.
「もしもし、ブラウンさんですか」「はい、そうです」
“Hello, is this Mr. Brown?” “Yes, speaking.”
“Are you students?” “Yes, we are.”
“Are you a teacher?” “Yes, I am.”
“Are these your cars?” “Yes, they are.”
“Are you a Japanese student?” “Yes, I am.”