She had already finished her homework when I called her.（当我给她打电话时，她已经完成了作业。）

They had left the party before it started to rain.（在开始下雨之前，他们就已经离开了派对。）

By the time he arrived at the station, the train had already gone.（当他到达车站时，火车已经开走了。）

We had visited that museum twice before last year.（在去年之前，我们已经参观过那个博物馆两次了。）

He had learned a lot of English words by the end of last term.（到上学期末，他已经学了很多英语单词。）

The children had fallen asleep when their mother got home.（当他们的妈妈到家时，孩子们已经睡着了。）

She had cooked dinner before her husband came back.（在她丈夫回来之前，她已经做好了晚饭。）

I had read that book three times before I lent it to him.（在我把那本书借给他之前，我已经读过三遍了。）

They had built the bridge by the end of last month.（到上个月月底，他们已经建成了那座桥。）

He had repaired his bike before he rode it to school.（在他骑车去上学之前，他已经修好了他的自行车。）

We had seen that movie before it was shown on TV.（在那部电影在电视上播出之前，我们就已经看过了。）

The workers had finished the project ahead of schedule.（工人们已经提前完成了项目。）

She had written a letter to her friend before she went to bed.（在她上床睡觉之前，她已经给她的朋友写了一封信。）

They had cleaned the classroom when the teacher came in.（当老师进来时，他们已经打扫了教室。）

I had saved enough money to buy a new computer by last summer.（到去年夏天，我已经存够了钱去买一台新电脑。）

He had caught the fish before the sun set.（在太阳落山之前，他已经钓到了鱼。）

We had planned our trip carefully before we set off.（在我们出发之前，我们已经仔细地规划了我们的旅行。）

The students had prepared for the exam thoroughly before it began.（在考试开始之前，学生们已经为考试做了充分的准备。）

She had watered the flowers before it got dark.（在天黑之前，她已经浇过花了。）

They had decorated the house beautifully before the party.（在派对之前，他们已经把房子装饰得很漂亮了。）