--description--

You've learned that tone marks are always placed on finals, not initials. If there is more than one vowel in a syllable, here are three rules for deciding which vowel gets the tone mark:

• If there is a, the tone mark is placed on a.

• If there is no a, but there is o or e, the tone mark goes on whichever appears. These two will never appear together in the same final.

• If i and u appear together, the tone mark goes on the second one.

Because ai contains a, the tone mark goes on the a. For example, lái.

--instructions--

Listen to the audio and complete the syllable with the correct tone mark.

--fillInTheBlank--

--sentence--

BLANK

--blanks--

bǎi

--feedback--

This syllable combines the initial b with the final ai, and uses the third tone.

--explanation--

The audio pronounces the syllable bǎi, which consists of the initial b and the compound final ai. The tone mark is placed on the a, following the rule that if a is present, it receives the tone mark.

The syllable uses the third tone, which starts in the middle, falls to a low point and then rises again.

--scene--

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    ],
    "audio": {
      "filename": "ZH_A1_pinyin_compound_finals.mp3",
      "startTime": 1,
      "startTimestamp": 53.94,
      "finishTimestamp": 54.8
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      "character": "Lin Yating",
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      "dialogue": {
        "text": "bǎi",
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