Chinese Tone Sandhi Explained for Beginners

Tone sandhi is what happens when a Mandarin tone changes because of the syllable next to it.

If you are a beginner, you do not need the full linguistics version first. Learn these three patterns and you will already understand a lot of real speech:

• third tone + third tone
• 不 before a fourth tone
• 一 changing with the next syllable

If the basic tone shapes still feel shaky, keep the four Chinese tones nearby. This guide starts where that one stops: what happens when tones touch each other in actual words.

What is tone sandhi in Mandarin?

Tone sandhi means the written tone and the spoken tone do not always match one for one in connected speech.

That does not mean the word is "wrong." It means Mandarin sounds more natural when certain tone combinations shift a little.

Here is the beginner version:

Pattern	Written form	What you usually hear	Example
3rd tone + 3rd tone	the first tone mark stays 3rd in writing	the first syllable sounds closer to 2nd tone	nǐ hǎo -> ní hǎo
不 + 4th tone	不 is still written bù	不 sounds like bú	bù shì -> bú shì
一 before another syllable	一 stays written as yī	pronunciation changes with the next tone	yì tiān, yí yàng, yí ge

The important thing to notice is this: tone sandhi is mostly about pronunciation, not spelling. You still write the usual pinyin.

Third Tone Sandhi: Why nǐ hǎo Sounds Like ní hǎo

This is the tone-change rule beginners notice first.

When two third tones come together, the first one usually changes in speech and sounds closer to a second tone. That is why 你好 is written nǐ hǎo, but usually heard as ní hǎo.

Here are a few common examples:

Written	What you usually hear	Meaning
nǐ hǎo	ní hǎo	hello
kě yǐ	ké yǐ	can / okay
lǎo hǔ	láo hǔ	tiger

Two things help here:

1. You do not change both syllables. Usually the first third tone is the one that changes.
2. You do not need to rewrite the pinyin. The spelling stays nǐ hǎo.

This rule also explains why many beginners sound overly careful at first. They try to pronounce both third tones with a full dip. In real speech, that usually sounds stiff and heavy.

If you still need a cleaner feel for how the third tone behaves on its own, read what pinyin is together with the four Chinese tones. Tone sandhi makes more sense once the basic tone shapes are already familiar.

How 不 Changes Tone

不 is written bù, but before a fourth-tone syllable it usually changes and sounds like bú.

That gives you patterns like:

• 不是 -> bú shì
• 不要 -> bú yào
• 不对 -> bú duì

When 不 is not before a fourth tone, it often stays bù.

Phrase	Usual pronunciation	Why
不是	bú shì	the next syllable is 4th tone
不要	bú yào	the next syllable is 4th tone
不好	bù hǎo	the next syllable is 3rd tone
不来	bù lái	the next syllable is 2nd tone

This is a good beginner reminder that Mandarin tone changes are often local. You do not need to analyze the whole sentence. Often you just need to notice the next syllable.

How 一 Changes Tone

一 is the one beginners usually find messier, mostly because it changes in more than one direction.

The short, usable version is:

• on its own, it is yī
• before a fourth-tone syllable, it usually becomes yí
• before many first-, second-, or third-tone syllables, it usually becomes yì

Examples:

Written	Usual pronunciation	Meaning
一	yī	one
一天	yì tiān	one day
一年	yì nián	one year
一点	yì diǎn	a little / a bit
一样	yí yàng	the same
一个	yí ge	one / a

一个 is worth calling out because beginners hear it all the time. If you learned 一 as yī, then hear yí ge, it can sound surprising at first. It is still the same word. This is just tone sandhi showing up in a very common phrase.

Common Beginner Mistakes With Tone Sandhi

• trying to pronounce every written tone in full, even in fast speech
• thinking the spelling should change because the pronunciation changed
• learning rules as abstract facts instead of inside real phrases
• overthinking long tone chains before getting comfortable with short pairs
• studying tone marks without listening to real audio

Most tone sandhi problems come from one habit: learning tones as isolated symbols instead of as parts of words.

How To Practice Mandarin Tone Changes

The best way to practice tone sandhi is to work in short chunks.

Start with a few useful phrases:

• nǐ hǎo
• bú shì
• bú yào
• yì diǎn
• yí ge

Then use a simple routine:

1. Look at the written pinyin first.
2. Listen to a native speaker say the whole phrase.
3. Repeat the phrase as one chunk, not syllable by syllable.
4. Record yourself once or twice.
5. Compare what you said with the original audio.

If you want a broader pronunciation routine, how to learn pinyin gives you a cleaner practice sequence. If you want a phrase where third tone sandhi shows up right away, how to say hello in Chinese is an easy place to start.

What To Learn After Tone Sandhi

Once tone sandhi stops feeling mysterious, your next step is not more theory. It is more useful beginner input.

That usually means:

• reviewing the four Chinese tones so the tone shapes feel steadier
• using how to learn pinyin if you need a more repeatable practice routine
• building real beginner vocabulary with the HSK 1 vocabulary list

Letsgo Chinese helps with this exact gap: you do not have to guess why a tone changed. You can hear a native speaker say the word, watch the mouth movement, and review it again with flashcards until the pattern starts to feel normal.