We should drink boiled water.我们应该喝开水。

A water and soil conservation project set up in 1989 resulted in farmers replacing their crops with trees or grass.

启动于1989年的一个水土保持项目使得农民退耕还林或退耕还草。

The carbon produced when we breathe is much less than that produced by cars.

我们呼吸产生的碳远远少于汽车产生的碳。

There are some fallen leaves on the ground.

在地上有一些落叶。(不及物动词fall的­ed形式fallen不表示被动，只表示动作的完成)

[学法点拨]　单个的动词­ed形式作定语，往往放在被修饰的名词之前；动词­ed形式短语作定语，一般要放在被修饰词的后面。

Because of pollution，the caught fish were not fit to eat.

由于污染，捕到的鱼不适宜吃。

2．作表语

动词­ed形式作表语，表示主语的性质、特征或状态。动词­ed形式作表语时，被动意味很弱，主要表示动作的完成和状态。此时的动词­ed形式相当于一个形容词，其后常不跟by短语。

The glass is broken.玻璃杯碎了。

Our classroom is crowded.我们的教室很拥挤。

The ground is covered with snow.地上覆盖着雪。

[学法点拨]　表示人的心理、情绪变化的一些动词­ed形式(surprised，disappointed，delighted，excited，pleased)及其他一些动词­ed形式(dressed，drunk，devoted，lost，known，married，bent，recovered，separated等)常可用作表语，表示状态。其中有些只表状态，毫无被动意义。

I was excited to hear our team had won.

我听到我们队已经获胜的消息后感到很兴奋。

He is dead drunk.他喝得烂醉。

[误区警示]　被动语态的过去分词，动作意味很强，句子主语为动作的承受者，后常跟"by＋动作的执行者"。

The new tissues and organs are used to cure diseases by doctors.这些新的组织和器官被医生用来治疗疾病。

A great number of trees were planted by volunteers to stop the wind from blowing the soil away.

为了阻止风把泥土吹走，志愿者们栽种了大量的树。

3．作宾语补足语

动词­ed形式作宾语补足语时，其逻辑主语是句子的宾语。宾语与宾语补足语之间是被动关系。

The villagers had many trees planted then.

村民们那时种了很多树。

In the morning people woke up and found the world outside their houses completely changed.