Steps to change word from lowercase to uppercase:
1. Open word and create a new blank document;
2. Enter a string of text, including lowercase letters, uppercase letters and Chinese characters;
3. Select the area where you want to change the uppercase and lowercase letters;
4. Press the "shift" and "F3" keys on the keyboard at the same time. You can find that the lowercase letters are completely changed to uppercase letters, and there is no change in other places;
5. Press shift F3 again, and the uppercase letters in the selected area will become lowercase again;
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