写作思路
因为你的题目太简单了，我就按照这个大的范围构思一篇。我就假设以学生会主席给外教Mr. Smith发一封邀请邮件参加郊游活动柜。要点包括郊游的时间及地点、集合时间及地点、出行方式、携带的物品等，无论参加与否，请在下周五之前回复。
双语范文参考
Dear Mr Smith,
I am Li Hua, Chairman of the Students’ Union. I am glad to invite you on behalf of the Students’ Union to attend an outing which is to be held at Nan Shan next Sunday.
If you are willing to go with us, please make sure of the following things. We will gather at the school gate at 7:30 in the morning on Sunday. It couldn’t be better if you can come to meet us on time. Then we will go there by bike together. Things that should be taken with us will include necessary food, water, clothing, a camera and so on.
Please make sure to let us know before next Friday whether you will join us. We are looking forward to your reply.
Yours sincerely,
Li Hua
亲爱的史密斯先生：，
我是学生会主席李华。我很高兴代表学生会邀请你们参加下周日在南山举行的郊游。
如果你愿意和我们一起去，请确认以下事项。星期天早上7:30我们将在学校门口集合。如果你能准时来见我们，那就再好不过了。然后我们一起骑自行车去那里。我们应该随身携带的物品包括必要的食物、水、衣服、照相机等。
请务必在下周五之前告诉我们你是否会加入我们。我们期待着您的答复。
谨上，
李华
写作模板参考
Dear Mr Smith,
I am.................I am glad to invite you .......................
If you are willing to go with us, please make sure of the following things. .................on Sunday...........................
Please make sure to let us know before ............whether you will join us. We are looking forward to your reply.
Yours sincerely,
Li Hua
亲爱的史密斯先生：，
我是..................我很高兴代表学生会邀请你参加..................
如果你愿意和我们一起去，请确认以下事项。星期天..................
请务必在...........之前告诉我们你是否会加入我们。我们期待着您的答复。
谨上，
李华