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When I was in my first year of grad school, I was also really busy. I had essays and exams every week, and I would spend hours in the library studying.
Lucy描述了她研究生一年级时候的情景，用I would spend hours in the library studying 来表达自己常去图书馆自习。
在这里，情态动词would表示过去的习惯，和used to的区别在于，used to具有 现在已经没有这个习惯了 的含义。
When I first entered hight school, I used to do my homework alone. Later, I made some new friends, and we would study together after class.