besadtodosth造句
2. The pen is used to write letters.
3. She is used to living in a big city.
以下是使用 \"be used to doing sth\" 和 \"be used to do sth\" 构造的例句：
1. I am used to doing my morning exercises. （我习惯于早上做早操。）
2. The pen is used to write letters. （这支笔被用来写信。）
3. She is used to living in a big city. （她习惯了住在大城市。）
