一、日常场景类

1. The letter was sent by my friend yesterday.（昨天我朋友寄来信件）

2. The cake was baked by the chef in the kitchen.（蛋糕是由厨师在厨房烤制的）

3. The homework was done by the students last night.（作业是学生们昨晚完成的）

二、自然现象类

1. The wind blows the leaves in autumn.（秋天风把叶子吹落）

2. The river flows through the city.（河流穿过城市）

3. The sun rises in the east.（太阳从东方升起）

三、社会现象类

1. The movie was directed by a famous director.（这部电影由著名导演执导）

2. The policy was introduced last year.（政策是去年推出的）

3. The news was reported by the newspaper.（新闻被报纸报道）

四、被动语态结构特点类

1. The problem was solved by the team.（问题被团队解决）

2. The song was composed by Mozart.（这首歌由莫扎特创作）

3. The experiment was conducted with great care.（实验是谨慎进行的）

五、强调动作承受者类

1. The cake was baked in the oven.（强调“蛋糕”而非“烤制动作”）

2. The letter was read aloud by the teacher.（强调“读出声”而非“老师”）

3. The meeting was held in the conference room.（强调“会议”而非“召开动作”）

注：部分例句为常见被动结构，而"被动+be动词+过去分词"是被动语态的核心构成。建议结合具体语境选择使用，注意be动词与主语的人称和数保持一致。