参考答案：

Differences exist in what to thank for, how to thank others and whom to thank. English speakers usually express their gratitude for both minor and major favours others have done them, while Chinese speakers may omit the expressions of gratitude for minor favours. English speakers think it enough to say "Thank you very much. I really appreciate your help." when a major favour has been done them, while in the same situation Chinese speakers may express their gratitude repeatedly. In English culture people thank their family members for what they have done for them, while in Chinese culture family members seldom exchange expressions of gratitude.