カランメソッドの瞬間英作文 STAGE2 LESSON10

Am I writing in the book? いいえ、あなたは本に書いていません。あたなは本を読んでいます。 瞬間英作文 瞬間英作文 No, you aren't writing in the book; you're reading the book.

It depends on what you are emphasizing in the sentence.
If you want to emphasize the “you” part, you would say “you aren’t.” For example, we’re going to work tomorrow, but you aren’t.
If you want to emphasize the “not” part, you would say “you’re not.” For example, you’re not going to paint my bedroom black.

参考：https://www.quora.com/Is-it-You-aren-t-or-You-re-not

Does he speak Jpanese? いいえ、彼は日本語を話しません。彼は英語を話します。 瞬間英作文 瞬間英作文 No, he doesn't speak Japansese; he speaks English