好的，下面是60个用过去完成时造的句子，适合小学生理解。我会给每个句子的词语附上意思和拼音。
I had eaten breakfast before I went to school.
词语：eaten（吃过）
句子意思：我上学前已经吃过早餐了。
She had finished her homework when I called her.
词语：finished（完成）
句子意思：我打电话给她时，她已经做完作业了。
We had played basketball before it started raining.
词语：played（玩）
句子意思：在开始下雨前，我们已经打完篮球了。
He had visited the museum before the tour began.
词语：visited（参观）
句子意思：旅游开始前，他已经参观过博物馆了。
They had already left when I arrived at the party.
词语：left（离开）
句子意思：我到派对时，他们已经离开了。
I had cleaned my room before my mom came home.
词语：cleaned（清理）
句子意思：妈妈回家之前，我已经打扫过房间了。
She had read the book before the teacher asked about it.
词语：read（读）
句子意思：老师问起这本书之前，她已经读过了。
We had met before, but I didn’t remember her name.
词语：met（见面）
句子意思：我们以前见过，但我不记得她的名字了。
They had already eaten lunch when we arrived at the restaurant.
词语：eaten（吃）
句子意思：我们到餐馆时，他们已经吃过午餐了。
I had never seen such a beautiful sunset before.
词语：seen（看见）
句子意思：我以前从未见过如此美丽的日落。
He had written the letter before he went to bed.
词语：written（写）
句子意思：他睡觉前已经写好信了。
She had made a cake when I got to her house.
词语：made（做）
句子意思：我到她家的时候，她已经做了一个蛋糕。
I had found my keys before I went out.
词语：found（找到）
句子意思：我出门前已经找到了我的钥匙。
We had studied for the test before the weekend.
词语：studied（学习）
句子意思：我们在周末之前就已经为考试学习了。
They had watched the movie before we arrived at the cinema.
词语：watched（看）
句子意思：我们到电影院时，他们已经看过电影了。
She had practiced the piano before her performance.
词语：practiced（练习）
句子意思：她在表演之前已经练过钢琴了。
I had heard the news before I saw it on TV.
词语：heard（听到）
句子意思：我在电视上看到新闻之前已经听说过了。
He had already gone to sleep when I got home.
词语：gone（去）
句子意思：我回家时，他已经睡着了。
We had cleaned the house before the guests arrived.
词语：cleaned（打扫）
句子意思：客人到来之前，我们已经打扫了房子。
She had traveled to many countries before she turned 20.
词语：traveled（旅行）
句子意思：她在20岁之前已经去过很多国家。
I had not finished my work when the bell rang.
词语：finished（完成）
句子意思：铃声响起时，我还没做完作业。
We had never been to that park before.
词语：been（去过）
句子意思：我们以前从未去过那个公园。
He had gone to the store when I called him.
词语：gone（去）
句子意思：我打电话给他时，他已经去商店了。
I had seen that movie before, so I didn’t want to watch it again.
词语：seen（看过）
句子意思：我看过那部电影，所以我不想再看一次。
She had studied hard before the final exam.
词语：studied（学习）
句子意思：她在期末考试前已经努力学习了。
We had finished the project before the deadline.
词语：finished（完成）
句子意思：我们在截止日期前已经完成了项目。
They had played outside before it got dark.
词语：played（玩）
句子意思：天黑之前，他们已经在外面玩了。
I had forgotten to bring my homework to school.
词语：forgotten（忘记）
句子意思：我忘记带作业去学校了。
She had met my friend before the party.
词语：met（见面）
句子意思：派对之前，她已经见过我的朋友了。
We had walked to the park before it started raining.
词语：walked（走）
句子意思：在开始下雨前，我们已经走到公园了。
He had already left the office when I arrived.
词语：left（离开）
句子意思：我到办公室时，他已经离开了。
I had read that book before it became famous.
词语：read（读）
句子意思：这本书变得有名之前，我已经读过了。
We had bought the tickets before the concert.
词语：bought（买）
句子意思：我们在音乐会之前就买了票。
They had finished their lunch by the time I got there.
词语：finished（吃完）
句子意思：等我到那里的时候，他们已经吃完午餐了。
I had cleaned my shoes before I went to the party.
词语：cleaned（清洁）
句子意思：我去派对之前已经把鞋子擦干净了。
She had finished the puzzle before I arrived.
词语：finished（完成）
句子意思：我到达时，她已经完成了拼图。
We had waited for hours before the train arrived.
词语：waited（等待）
句子意思：火车到达之前，我们等了好几个小时。
He had learned how to ride a bike when he was six.
词语：learned（学会）
句子意思：他六岁时就学会了骑自行车。
I had never been to that restaurant before.
词语：been（去过）
句子意思：我以前从未去过那家餐厅。
She had played the piano for years before she became a teacher.
词语：played（弹奏）
句子意思：她在成为老师之前已经弹钢琴多年了。
We had decided to stay home before the storm started.
词语：decided（决定）
句子意思：暴风雨开始前，我们已经决定留在家里。
He had never seen snow before he went to the mountains.
词语：seen（见过）
句子意思：他去山里之前从未见过雪。
I had forgotten about the meeting when my boss reminded me.
词语：forgotten（忘记）
句子意思：当我的老板提醒我时，我已经忘记了会议。
They had already packed their bags when I called them.
词语：packed（打包）
句子意思：我打电话给他们时，他们已经打包好行李了。
We had made plans before we found out about the event.
词语：made（做）
句子意思：在知道这个活动之前，我们已经制定了