Negating with 不 (bù)

1. The Character for 'Not': 不 (bù)

The character 不 (bù) is your primary tool for negation in Mandarin. It's incredibly common and versatile.

• Pinyin: bù
• Tone: 4th tone (a sharp, falling tone)
• Meaning: not; no

Character Analysis

As an ideograph, the character's form hints at its meaning. An ancient interpretation suggests it depicts a bird flying up towards the sky (represented by the top horizontal line 一) but being unable to pass it, thus representing the concept of "not." It's composed of four simple strokes.

Writing Practice

Mastering characters starts with the correct stroke order. Given your analytical preference, paying close attention to this foundational step will serve you well.

Please take about 5 minutes to practice writing the character 不 on paper.

2. Forming Negative Sentences: 不是 (bùshì)

Negating the 'to be' verb in Chinese is straightforward. You simply place 不 (bù) directly before 是 (shì).

The structure is as follows:

This creates the phrase 不是 (bùshì), which means "am not," "is not," or "are not." Let's examine this in an article.

As you've just read, we can now turn the sentences from our last lesson into their negative forms:

• 我 不是 人。 (Wǒ bùshì rén.) — I am not a person.
• 她 不是 女人。 (Tā bùshì nǚrén.) — She is not a woman.
• 他们 不是 大人。 (Tāmen bùshì dàrén.) — They are not adults.

The core logic remains simple: 不是 functions as a single unit meaning "is not."

3. A Crucial Pronunciation Rule: Tone Sandhi

There is a critical pronunciation detail you must learn. While the pinyin is written as bùshì, it is not pronounced that way.

• 不 (bù) is a 4th tone.
• 是 (shì) is also a 4th tone.

The Rule: When 不 (bù) is followed by another 4th tone syllable, its own tone changes from the 4th tone (falling) to the 2nd tone (rising).

Therefore, the combination is pronounced búshì, not bùshì.

This rule, called tone sandhi, is not optional; it's a fundamental part of spoken Mandarin. Let's see it in action.

To reinforce this concept, here is a visual summary of the rule. Although the examples are different, the principle is the same.

4. Why '不' and Not Another Word?

In Chinese, there are two main words for negation: 不 (bù) and 没 (méi). A common point of confusion for learners is when to use which.

The rule regarding 是 (shì) is absolute and simple: 是 is always negated by 不. This applies whether you are talking about the present or the past.

This strict rule—that only 不 negates 是—is an important one to internalize.

5. Practice Time

Let's integrate what you've learned.

1. Writing & Pronunciation:

• Continue practicing the four strokes of 不 until you can write it from memory.
• Say the phrase 不是 out loud several times, focusing on the bú (rising) shì (falling) tone combination.

2. Sentence Translation:
Translate the following sentences. Write them using Chinese characters and include pinyin with the correct tone marks (remembering the change for búshì).

1. I am not an adult.
2. You are not a woman.
3. He is not a person.

Answers:

1. 我不是大人。(Wǒ búshì dàrén.)
2. 你不是女人。(Nǐ búshì nǚrén.)
3. 他不是人。(Tā búshì rén.)

Conclusion

Excellent work today. You have now mastered a fundamental pair of concepts: affirming with 是 and negating with 不是. This dramatically expands the range of ideas you can express.

Key Takeaways:

• The character 不 (bù) means "not" and is used to form negative statements.
• To negate 是 (shì), you place 不 before it to form 不是 (bùshì).
• Crucial Tone Rule: When 不 (bù) precedes a 4th-tone character like 是 (shì), its pronunciation changes to the 2nd tone: búshì.
• Grammar Rule: The verb 是 (shì) is always negated with 不 (bù), never with other negation words.

Preview of the Next Lesson:
The tone change rule for 不 (bù) that you learned today is the most common one, but it's not the only one. In the next lesson, we will focus exclusively on this rule, examining how the tone of 不 behaves when placed before other tones. This will complete your understanding of this key character's pronunciation.