I ... my homeworkThis is an incomplete phrase: 私は means “as for me” or “I,” and 宿題を means “homework” marked as the object of the following verb. It is commonly followed by verbs such as する (do), 済ませる (finish), or 終える (complete).
JA: 私は宿題を終えてから、友達に電話した。
EN: I called my friend after finishing my homework.