出国留学邀请信的英文写作格式通常包括以下几个部分：
邀请函开头
使用正式的问候语，如 "Dear [Recipient's Name]," 或 "To Whom It May Concern,"。
邀请目的
明确说明邀请的目的，即邀请对方出国留学。
邀请细节
包括邀请的时间段，例如 "from [Start Date] to [End Date]."
提及邀请的具体地点或学校，以及对方将要进行的活动或学习内容。
邀请的理由
简述为什么希望对方接受邀请，可以包括学习机会、文化交流等方面。
期望的回应
请求对方确认是否能够接受邀请，并告知对方如何回复。
结束语
使用正式的结束语，如 "Sincerely," 或 "Yours faithfully,"。
签名
如果是手写信件，应有发件人的亲笔签名和日期。
```
Dear [Recipient's Name],
I am writing to extend an invitation for you to pursue your education abroad. It is with great pleasure that I invite you to join our institution for the [Duration of Study] starting from [Start Date] to [End Date].
At our university, you will have the opportunity to study [Subject of Study] in a dynamic and international environment. We believe that this experience will be invaluable in preparing you for a successful career in [Field of Study].
We look forward to welcoming you to our campus and supporting you throughout your academic journey. Please let us know if you are able to accept this invitation by [Response Deadline].
We wish you all the best in your educational pursuits.
Sincerely,
[Your Name]
[Your Position]
[Your Institution]
[Contact Information]
```
请根据具体情况调整上述模板中的内容。希望这能帮助你撰写出合适的出国留学邀请信