英语作文正文的开头有多种方法，可以根据文章的类型和目的选择合适的方式。以下是一些常见的开头形式：

开门见山：

直接揭示文章的主题。例如：

"A Trip to Jinshan" （去金山旅游） 的开头："The day before yesterday my class went on a bus trip to Jinshan. The bus ride there took three hours. The long trip made us very tired, but the sight of the beautiful sea refreshed us."

回忆性开头：

通过回忆的方式来引入文章。例如：

"A Trip to the Taishan Mountain" （泰山游） 的开头："I remember my first trip to the Taishan Mountain as if it were yesterday."

概括性开头：

对文章将要叙述的人或事进行概括性介绍。例如：

"A Trip to Huangshan" （黄山之旅） 的开头："Last month, my family went to Huangshan by train. It took us ten hours to get there. What a long and tiring journey! We were tired but the beautiful scenery excited us."

引用法：

引用名人名言或代表性观点来引出文章的主题。例如：

"The Time and the Money" （时间和金钱） 的开头："Most people say that money is more important than time. But I don't think so. First, when money is used up, you can earn it back, but..."

情景引入：

根据写作要求中的“情景”，INTRODUCTION部分单纯介绍社会生活现状或引出人们对同一社会现象的不同看法。例如：

"Every college student would agree that life in college is not the same as it was in the middle school. I think there are many differences as well as similarities."

名言引用：

如果记不住具体的名言，可以编写一个听起来有道理的名言。例如：

"Aproverbsays, 'You are only young once.'"

选择合适的开头方式可以使文章更加引人入胜，同时也为后续的论述或叙述打下良好的基础。根据具体的写作要求和文章内容，选择最适合的开头方法，能够有效地吸引读者的注意力。