求翻译：请输入您需要翻译的文本！假如你是玛丽，你的朋友汤姆邀请你参加他在本周晚上举行的生日聚会，但你不能参加，请你用英语写一封信告诉他原因。是什么意思？

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Please enter the text you need to be translated! If you are a Queen Mary, your friend Tom invites you to participate in his birthday party held at night this week, but you cannot participate, please write a letter in English you tell him.

Please input the text which you need to translate! If you are Mary, your friend Tom invites you to participate in him the birthday meeting which holds in this week evening, but you cannot participate, ask you to use English to write a letter to tell him the reason.

Please enter the text you need to translate! If you were Mary, your friend Tom invites you to attend his birthday party at night this week, but you can't attend, please write a letter in English to tell him the reason.