Thank you for asking me to your house this weekend. I'd really love to, but I'm afraid I am not available. I have to help my parents with the housework tomorrow morning. In the afternoon, I will go shopping with my mother. On Sunday, I have to study for the Chinese test. I promised my friend that I would go to the concert with him in the evening. What a busy weekend！(答案不唯一，合理即可)
