1. Introduction to regular script: This copybook is suitable for beginners. By practicing basic regular script strokes and glyphs, it is helpful to improve the standardization and aesthetics of writing.

2. Introduction to running script: Running script is a variant of regular script, which is more fluent and unique. This copybook is suitable for people who want to improve their writing speed and fluency.

3. Introduction of cursive script: Cursive script is the most artistic font in China's calligraphy, which is suitable for people with a certain foundation to practice. This copybook can help improve the speed and variability of writing.

4. Brief introduction of official script: Official script is a font used in ancient official documents, with unique lines and structure. This copybook is suitable for people interested in ancient culture to practice.

5. "Introduction to seal script": seal script is the font used in ancient seals, which has the characteristics of founder and rigidity. This copybook is suitable for people interested in ancient seal culture to practice.

6. Brush copybook: Brush copybook is the practice material of traditional calligraphy in China, suitable for people who want to learn traditional calligraphy. You can choose copybooks with different fonts and difficulty to practice.

The above are some copybooks recommended for adults to practice calligraphy. Choosing a copybook that suits you according to your personal interests and needs can improve the standardization and aesthetics of writing.