1.You can list various situations or occasions when you express gratitude by saying 'thank you'. 2.Explain the importance of expressing gratitude in different contexts, such as showing appreciation, politeness, or acknowledging help.

1.你可以列举各种表达感谢时使用“thank you”的情境或场合。 2.解释在不同语境中表达感谢的重要性，例如表示感激、礼貌或承认帮助。