1. Time marking: clearly mark the morning and afternoon time in the article so that readers can clearly understand the time sequence. For example, "start work at 9 am and get off work at 5 pm".

2. Describe the activities: you can make the transition by describing the activities in the morning and afternoon. For example, "I go to the gym in the morning and study in the library in the afternoon."

3. Describe feelings: you can transition by describing feelings in the morning and afternoon. For example, "I felt a little sleepy in the morning, but my mental state gradually improved in the afternoon."