She is reading a book in the corner, completely absorbed in the story.（她正在角落里看书，完全沉浸在故事中。）

They are playing football on the field, running and shouting excitedly.（他们正在球场上踢足球，兴奋地奔跑呼喊着。）

The children are watching an interesting movie, laughing loudly from time to time.（孩子们正在看一部有趣的电影，时不时大声笑着。）

My mother is cooking dinner in the kitchen, humming a pleasant tune.（我妈妈正在厨房做晚餐，哼着一首动听的曲子。）

He is writing a letter at the desk, pausing occasionally to think.（他正在书桌前写信，偶尔停下来思考。）

The birds are singing in the trees, fluttering their wings gracefully.（鸟儿在树上唱歌，优雅地扇动着翅膀。）

We are having a picnic by the lake, enjoying the beautiful scenery around.（我们正在湖边野餐，欣赏着周围美丽的风景。）

The old man is walking slowly in the park, feeding the pigeons along the way.（老人正在公园里慢慢地散步，沿途喂着鸽子。）

The students are discussing a difficult problem in the classroom, expressing their different opinions.（学生们正在教室里讨论一个难题，表达着他们不同的观点。）

She is dancing in the hall, moving her body rhythmically.（她正在大厅里跳舞，有节奏地扭动着身体。）

The workers are building a new house, carrying bricks and cement busily.（工人们正在建造一座新房子，忙碌地搬运着砖块和水泥。）

I am listening to music in my room, tapping my feet to the beat.（我正在房间里听音乐，随着节拍轻拍着脚。）

The baby is sleeping in the crib, breathing gently.（婴儿正在婴儿床里睡觉，轻轻地呼吸着。）

They are planting trees in the garden, digging holes and watering them carefully.（他们正在花园里种树，小心地挖着坑并浇水。）

The artist is painting a picture on the canvas, using various colors skillfully.（艺术家正在画布上作画，熟练地运用着各种颜色。）

My father is fixing the car in the garage, checking the engine attentively.（我父亲正在车库里修车，专心地检查着发动机。）

The athletes are training on the track, sweating profusely but never giving up.（运动员们正在跑道上训练，汗流浃背但从不放弃。）

The volunteers are helping the poor in the community, distributing food and clothes kindly.（志愿者们正在社区帮助穷人，亲切地分发着食物和衣服。）

She is shopping in the mall, looking for some new clothes.（她正在商场里购物，寻找一些新衣服。）

The scientist is doing an experiment in the lab, observing the results closely.（科学家正在实验室里做实验，仔细地观察着结果。）