帮忙写一篇英文邀请函 邀请朋友来参加生日聚会.

题目

帮忙写一篇英文邀请函 邀请朋友来参加生日聚会.
开头：do not hesitate to make a request if it is reasonable
要求：make the request specific ,using a polite tone
convincingly the reason for the request
let the recipient know why you came to him/her for help
mention it if there is something in return
do not hesitate to make a request if it is reasonable 这个也是要求!不是开头!不是生日.

答案

Dear classmates,
As part of the activities of Project Hope,we will organize several groups of students of different specialties to help the pupils with their studies in the western part of our country from July 14 to August 20.Those who are voluntary to offer their help should enroll their names to the Students Union before June 27.We believe these volunteers will also benefit a lot from this activity.
Students Union