1. The tone of ao is marked on a, such as: āo, áo, ǎo, ào 2. The tone of ou is marked on o, such as: ōu, óu, ǒu, òu 3. The tone of ui is marked on i, such as: duī, duǐ, duì Pinyin tone marking formula: a, o, e, i, u, ü. Ou combination pronunciation jingle: ①, [au] ou combination: cloudy cloudy house mouse mouse about mouth blouse women's shirt mountain mountain ②, [au] ow combination: cow cow how, how much now now brown.
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