I is a vowel in Chinese Pinyin, and the letter I appears as a vowel phoneme in Chinese Pinyin. Mandarin with the letter I has 16 vowels, namely I,–I (front),–I (back), in, ing, ia, ie, iao, iou, ian, iang, ai, e I, uei and uai.
The share and coverage of the letter I in the vowels of Putonghua exceeds 40%, and there are more than 140 I in the 400 basic syllables of Putonghua, accounting for one third of the basic syllables.
Capital letters or capital letters are one of the writing forms of many pinyin letters, such as A, B, C and so on.
The height and width of uppercase and lowercase fonts are obviously different, but in some languages, there is no case difference. In the early days of invention, there was only one font for Latin letters, that is, capital letters.
Use of capital letters
1, used at the beginning of a sentence.
2. abbreviations.
3. Increase readability. For example: signs and labels.
4. In some languages, it has the function of emphasis. It is equivalent to an exclamation point in Chinese.
5. Proper nouns such as names and place names.