Third Tone Sandhi Guide: How Mandarin Third Tone Changes in Real Speech

When two third tones appear together, the first one usually changes to a rising tone in natural speech. That is why 你好 is written nǐ hǎo but pronounced closer to ní hǎo.

This rule is called third tone sandhi. It matters because many useful beginner words contain two third tones, including 你好, 很好, 可以, and 老板. Learning the change inside real words is easier than memorizing an abstract rule.

Textbooks often draw third tone as a full falling-rising curve, but everyday Mandarin often uses a low, short third tone unless it stands alone or needs emphasis. Trying to dip every third tone fully can make your speech slow and unnatural.

Practice short phrases such as 我想去, 你可以, 很好吃, and 买两杯. Listen for the low shape and the changed first third tone before repeating.

A useful practice loop is: choose one common phrase, say it slowly, say it at natural speed, then use it in a sentence. For example: 很好 → 很好吃 → 这个很好吃.

If you only drill syllables, the rule may disappear during conversation. Place third tone sandhi into restaurant, taxi, hotel, and daily-life answers so pronunciation and communication improve together.