"How to Say 'Pay Attention in Class' in English" is a common question among Chinese students who are learning English as a second language. The translation of "上課認真聽講" into English is "pay attention in class". However, if you want to make your sentence sound more formal or polite, you can use different expressions. For example:

- Make sure to focus and listen attentively during class.

- It is important to be engaged and present during lessons.

- Please take notes and participate actively in class discussions.

- Pay close attention to the teacher's instructions and explanations.

I hope this helps! Let me know if you have any other questions.

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