假定你是李华，是某国际高中英语角的负责人。校英语角打算下周五举办一场关于英语方言的讲座，请用英语给你校外籍教师Mr. Smith写一封邮件

【分析】
本篇书面表达属于应用文，要求给外籍教师Mr. Smith写一封邮件，邀请他担任英语方言讲座的主讲嘉宾。
【详解】第一步：审题
体裁：应用文  邀请信
时态： 一般现在时和一般将来时
结构：总分法
第一部分是文章的开头段，邀请Mr. Smith担任英语方言讲座的主讲嘉宾；第二部分是支持段，说明邀请他担任主讲嘉宾的理由和讲座的相关信息；第三部分是结尾段，希望得到对方的答复。
要求：
1. 说明写信是邀请Mr. Smith担任英语方言讲座的主讲嘉宾
2. 说明邀请他担任主讲嘉宾的理由和讲座的相关信息
①邀请他担任主讲嘉宾的理由：他对英语方言做了许多研究
②讲座的相关信息：时间是下周五下午3点至4点半；地点是学校报告厅
3. 希望得到对方的答复
第二步:列提纲 （重点词组）
 invite sb. to；English dialects；a language expert；do a lot of research on；appreciate；share …with sb.；understand English much better；from 3 pm to 4 :30 pm；be available  
第三步：连词成句
(1)I am writing to invite you to be our honored guest speaker for the coming lecture on different English dialects.
(2)As a language expert, you must have a lot to say about this topic.
(3)You have done a lot of research on English dialects.
(4) We would greatly appreciate it if you could come and share your study and findings with the students.
(5)I believe your vivid speech would help them understand English much better.
(6)The speech will be from 3 pm to 4 :30 pm next Friday in the lecture hall of our school.
(7)Will you be available then?
(8)I am looking forward to your early reply.
根据提示及关键词（组）进行遣词造句，注意主谓一致和时态问题。
第四步：连句成篇
 
表因果关系：therefore
【点睛】[高分句型1]
We would greatly appreciate it if you could come and share your study and findings with the students.（if引导条件状语从句）
[高分句型2]
I believe your vivid speech would help them understand English much better.（省略that的宾语从句）