【答案】Dear  Lucy,

        Thank you very much for inviting me to your party.I’d like to go but I can’t. My parents went to Beijing, They aren’t coming back until next month. And now I have to look after my grandma because she is ill in bed. And I also need to study for my coming English exam.I’m very sorry I can’t go to your party.Thank you for inviting me.

       I hope you can have a good time.

                                                  Yours,

                                                 Liuying

【解析】这篇作文要求我们以刘英的身份给Lucy写一封信，说明自己不能去参加Lucy的生日晚会，向对方表示感谢，并为自己不能去参加表示道歉。写作时，注意说明自己的情况，将自己不能去参加聚会的理由叙述清楚。注意信中应使用正确的语气，在拒绝别人的邀请的时候，语气要委婉。在表达的时候，还需要注意汉语习惯和英语的不同，使用正确的语序，注意时态和人称，保证语法的规范，正确使用动词、名词等。还应使用一些自己积累的短语和句型，句子之间使用恰当的过渡词，使文章的表达更加连贯、流畅。