When choosing soft-pen copybooks for adults to practice calligraphy, you can consider the following aspects:

1. Font style: Choose a font style that suits you according to your preferences and needs. Common font styles include regular script, running script, cursive script, etc. Each font has its own unique characteristics and beauty.

2. Difficulty level: Choose a copybook with a suitable difficulty level based on your calligraphy level and experience. Beginners can choose basic regular script copybooks and gradually increase the difficulty to challenge more advanced fonts.

3. Content selection: Choose appropriate content based on your interests and learning goals. You can choose some classic poems, famous sayings and aphorisms as practice content, or you can choose some practical daily expressions for practice.

4. Paper and binding: Choose the paper and binding method that suits you. Soft-pen copybooks are usually made of rice paper or rough-edged paper. The paper is soft and flexible, suitable for soft-pen writing. The binding method can be wire-bound or glue-bound, making it easy to carry and use.

5. Reference evaluation: You can refer to the evaluation and recommendations of other users to understand the quality and effect of the copybook. Relevant information can be obtained by reading books, searching the Internet, etc.

In short, when adults choose soft-pen copybooks for calligraphy practice, they should choose according to their own needs and level, paying attention to factors such as font style, difficulty level, content selection, paper quality, and binding, so as to improve the efficiency of calligraphy practice. Effective and fun.