写一篇100字左右的英语日记并不难，关键在于抓住一天中的重要事件和感受。以下是一个简单的范例：
March 5, 2023
Today was an interesting day. In the morning, I attended a math class where we solved some challenging problems. Lunch with friends was fun, and we talked about our future plans. In the afternoon, I went to the library to study. Evening was spent with family, watching a movie together. It was a productive and enjoyable day.
通过这个简短的范例，你可以根据自己的实际情况进行调整和丰富，使内容更贴近你的生活。