分析 本篇书面表达属于提纲类作文，根据提示信息假定你是李华，请给正在你校学习的英语交换生Bob写封邮件，通知他周末有义工活动，询问他是否参加．写作时注意以下几点：1、仔细阅读有关提示，弄清试题提供的所有信息，明确几个要点：主题：捡垃圾；时间地点；注意事项． 2、提纲是文章的总体框架，要在提纲的范围内进行分析、构思和想象．要依据提示情景或词语，按照一定逻辑关系来写．本文写作时可以按照要点所给的顺序写．3、根据要表达的内容确定句子的时态、语态．4．注意使用高级词汇和句式，以增加文章的亮点．【亮点说明】本文结构紧凑，层次分明，而且使用了多种表达：As you know正如你说知；be willing to 愿意做；in case以防；After all首先；Look forward to 盼望；As you know，the litter dropped around has affected the image of the city，so we are scheduled to collect and classify rubbish in Renmin Park．（高分句型一）I know you have a strong sense of social commitment and have always involved yourself in voluntary activities．（高分句型二）If you are willing to come，you'd better take gloves with you in case you might get hurt．（高分句型三）
解答 Dear Bob， I am writing to inform you that a voluntary activity is to be held this Sunday． As you know，the litter dropped around has affected the image of the city，so we are scheduled to collect and classify rubbish in Renmin Park．（高分句型一）I know you have a strong sense of social commitment and have always involved yourself in voluntary activities．（高分句型二）If you have intention to join us，we can meet at the school gate at 9：00 a．m．This activity will last （for） two hours．If you are willing to come，you'd better take gloves with you in case you might get hurt．（高分句型三）After all，safety goes first．Comfortable sneakers are also highly recommended． Looking forward to your reply． Yours， Li Hua
点评 英语写作是一项主观性较强的测试题．它不仅考查学生的写作基础而且还考查学生在写作过程中综合运用语言的能力．在撰写时要注意主谓语一致，时态呼应，用词贴切等．要提高英语写作水平，需要两方面的训练：一是语言基础方面的训练，要有扎实的造句、翻译等基本功，即用词法、句法等知识造出正确无误的句子；二是写作知识和能力 方面的训练以掌握写作方面的基本方法和技巧．