How to write the four tones of Pinyin?

The four tones of Pinyin: the first tone is represented by "ˉ", such as lā; the second tone is represented by "ˊ", such as lá; and the third tone is represented by "ˇ", such as lǎ;

The concept of "pinyin": Hanyu Pinyin is the official Latinization scheme of Chinese character pronunciation issued by the People's Republic of China (PRC), which was adopted by the former China Text Reform Commission (now the State Language and Literature Commission) during the text reform of 1955-1957. The Hanyu Pinyin Program was developed by the Hanyu Pinyin Program Committee of the former Chinese Character Reform Commission (now the State Language and Literature Working Committee) during the 1955-1957 character reform.

Features of "Pinyin":

Only the 26 internationally recognized letters are used, with no new letters added;

Additional symbols are not used as much as possible (only two additional symbols are used);

Variant readings are not used as much as possible;

Y,W and the diacritics "'" are used. "'" for soundproofing;

using four double letters zh,ch,sh,ng;

using four tone symbols to indicate the four tonal categories of yinping, yangping, supersonic, and descending;

adopting the order of the alphabet common to the Latin alphabet, and determining the names of the letters of the Hanyu Pinyin alphabet.

The "light tones" in pinyin tones: There is also a special tone in Chinese called the light tone, sometimes called the fifth tone, which is not labeled as a tone in hanyu pinyin.

Variations in Pinyin: After the four tones of Hanyu Pinyin are labeled, there are also variations in the tones of "one, seven, eight, and no" and the three tones in the process of reading aloud. Therefore, it is important to pay attention to the rules for reading the tones.