"I lost my student ID" 是在英语中表达 "我丢了我的学生证" 的常用说法。
其中 "lost" 是动词，意思是 "丢失"， "my" 是形容词性物主代词，意思是 "我的"， "student ID" 是名词，意思是 "学生证"。
下面是一些例句：
I lost my student ID card yesterday. (我昨天丢了我的学生证)
I can't find my student ID, I think I lost it. (我找不到我的学生证了，我想我把它丢了)
Have you seen my student ID anywhere? I can't find it and I think I lost it. (你在哪里看到我的学生证了吗？我找不到它了，我想我把它丢了)