高考英语介绍信常用句型包括：

开头句型

I’m now writing on behalf of the class to invite you to come and attend it, if you can spare the time.

I sincerely invite you to watch the show because...

介绍背景信息

My name is Li Hua. I’m writing to inform you about...

I come from a family of...

I was born in the year of...

描述个人特征

I am a student who is...

I have a strong interest in...

I am particularly good at...

说明目的或意图

I am writing to invite you to participate in...

I am writing to inform you about the...

I am writing to express my sincere wishes for...

结束语

I look forward to your reply.

Thank you for your time and consideration.

这些句型可以帮助你在高考英语介绍信中更准确地表达信息，使文章结构清晰、内容完整。