They were playing football in the park when it started to rain. （当开始下雨的时候，他们正在公园里踢足球。）

We were very excited about the upcoming concert. （对于即将到来的音乐会，我们非常兴奋。）

The children were laughing and running around the yard. （孩子们在院子里笑着、跑着。）

My parents were watching TV in the living room last night. （昨晚我的父母在客厅看电视。）

The flowers were blooming beautifully in the garden. （花园里的花儿正盛开得十分美丽。）

The students were listening attentively to the teacher's lecture. （学生们正在专心听老师讲课。）

They were planning a surprise party for their friend. （他们正在为朋友策划一个惊喜派对。）

We were waiting for the bus at the station for a long time. （我们在车站等公交车等了很长时间。）

The birds were singing sweetly in the trees. （鸟儿在树上欢快地歌唱。）

The workers were building a new house last month. （上个月工人们正在建造一座新房子。）

She was wearing a beautiful dress at the party. （她在聚会上穿着一条漂亮的裙子。）

He was reading a book in the library when I saw him. （我看到他的时候，他正在图书馆看书。）

The old photos were reminding me of my childhood memories. （这些老照片让我想起了童年的回忆。）

The clouds were floating slowly across the sky. （云朵在天空中缓缓飘浮。）

The athletes were training hard for the competition. （运动员们正在为比赛刻苦训练。）

The shops were crowded with people during the holiday. （假期期间商店里挤满了人。）

The leaves were falling down from the trees in autumn. （秋天树叶从树上飘落下来。）

They were discussing the problem seriously in the meeting. （他们在会议上认真地讨论这个问题。）

We were having a great time at the beach yesterday. （昨天我们在海滩上玩得很开心。）

The candles were burning brightly on the birthday cake. （生日蛋糕上的蜡烛明亮地燃烧着。）