"上周末我做了许多事情" 的英文表达为 "I did many things over the weekend."
"上周末" 的英文表达为 "over the weekend"。weekend 是英语中的常用词汇，指的是周末，周六和周日。而 over 是一个介词，表示在某一段时间内。
例句：
I went to the beach over the weekend. (上周末我去了海滩)
I spent the whole weekend studying for my exam. (我整个周末都在为考试学习)
I had a great time over the weekend with my friends. (上周末我和朋友们度过了愉快的时光)