英语作文中表达自己的想法，可以采用以下几种方式：

使用引导语

可以用短语 "I think that..." 或 "In my opinion..." 来开头，然后再接着自己的想法。例如：

I think that the best way to learn a new language is to immerse yourself in the culture.

In my opinion, technology has greatly changed our lives.

开门见山

直接提出你对这个问题的看法或要求，点出文章的中心思想。例如：

Learning English is crucial in today's globalized world.

结合个人经历

在描述自己的想法时，可以结合自己的经历或见闻，使文章更具说服力和感染力。例如：

I have always been fascinated by space exploration. The recent Mars rover missions have only deepened my interest.

使用修辞手法

尝试用比喻、拟人等修辞手法，使文章更加生动形象。例如：

Time is a thief, stealing moments from our busy lives.

结构清晰

英语作文讲究“起承转合”，即开头引入主题，中间展开论述，结尾总结升华。一个清晰的结构，能够帮助读者更好地理解你的观点。例如：

Introduction: I have always wanted to visit New York.

Body: I was amazed by the towering skyscrapers and the hustle and bustle of the city.

Conclusion: I realized that New York is a place where dreams come true.

积累素材

平时多读英文原著、观看英文纪录片、聆听英文演讲，积累词汇和思想，为写作提供灵感。例如：

Reading articles from reputable sources can help you learn new vocabulary and phrases that can be useful in your essays.

使用高级句型和短语

为了使文章更具高级感，可以积累一些高级句型和短语，如 "It is widely acknowledged that..."、"On the other hand..." 等。例如：

It is widely acknowledged that climate change is one of the most pressing issues of our time.

通过以上方法，你可以有效地在英语作文中表达自己的想法，使文章更具逻辑性和说服力。