在撰写高中英语介绍信时，以下是一些常用的句型：

问候语

Hello, nice to hear from you.

I'm very glad to hear that.

引入话题

I am writing to introduce myself and express my interest in...

I am writing to introduce my friend/colleague, who is interested in...

说明目的

It's worth thinking about. Let me tell you something.

This is very interesting, and I think you should think about it.

介绍基本信息

My name is [Your Name]. I am a student at [Your School].

I am writing to inform you about [Subject/Topic].

提供详细信息

I am particularly interested in [Specific Interest or Topic].

I have been involved in [Relevant Activity or Experience].

结束语

I look forward to hearing from you.

Thank you for considering my introduction.

这些句型可以帮助你在撰写介绍信时保持清晰、有条理，并且能够有效地传达你的意图和信息。希望这些信息对你有所帮助!