be seated 坐着，就座，相当于 seat oneself。

为什么怎么 be seated 理解成 seat oneself，其他的类似 be dressed,be lost,be drunk,be hidden 等也可以这样理解吗？

seat 作及物动词使用使，使某人坐下，如果宾语提前，需要使用被动形式，be seated.  例如pay sb 给某人发工资，sb get paid 某人已发工资。用法都是一样.

（特别备注：只要 动作执行者和承受者属于同一个人，才能使用be seated =seat oneself 这个结构，如果不相同只能使用 A seat B   A使B 坐下这个结构。）

解答如下：

seat主要有以下几种意思及用法

(1)n.座椅;椅子;座位;席位 ;臀部

Stephen returned to his seat. 

斯蒂芬回到自己的座位上。

Ann could remember sitting in the back seat of their car.  

安记得坐在他们车里的后排座上了。

He sat down on the nearest available seat.
他在最近的空座位上坐下来。

She got on the bus and picked a seat up front.
她上了公车，找了个最前面的座位。

He lost his seat in the Parliament at the election.
他在选举中失去了议会中的席位。

I have worn the seat of this skirt thin .
我已经把这条裙子的臀部磨薄了。

Washington is the seat of government of the US.
华盛顿是美国政府所在地。

Then he got up and brushed off the seat of his jeans.  

然后他站起来，拍了拍牛仔裤的臀部

(2)vt.使坐下;就座 

A: seat oneself 使某人自己坐下；某人自己坐下=be seated

Please seat yourself, sir.  

请坐,先生。

He seated himself at the desk.  

他自己坐在桌子旁。

He waved towards a chair, and seated himself at the desk.  

他挥手指了指一把椅子，自己在书桌旁坐了下来。

B:seat sb 使某人坐下；使某人就坐

He seated us and called to his daughter to bring tea.  

他让我们坐下,然后叫他女儿端茶来。

I seated him in the chair.  

我让他在椅子上坐下来。

The mother seated her child on a bench.  

母亲把孩子放在凳子上坐好。

We seated our guest to the right of the chairman.  

我们请来宾坐在主席的右边。

He waved towards a chair, and seated himself at the desk.  

他挥手指了指一把椅子，自己在书桌旁坐了下来。

We can only seat you in twenty minutes.

20分钟以后能安排您入座。

We can seat 300 in the auditorium.

我们这个礼堂可容纳三百人

C:be seated 某人自己坐下=seat oneself

Please be seated, gentlemen.  

请坐下,先生们。

He then asked me to be seated.  

然后他要我坐下。

Margaret was seated near the fire.  

玛格丽特坐在火炉旁边。

They were seated at their desks.  

他们在桌子边坐好了

(3)(房间、车辆)可坐…人，容纳…人

主语+seat +数词+名词，主语可以容纳多少人

The theatre seats 570.  

那个剧院可容纳 570 人。

We want to buy a car that can seat five persons.

我们想要买一辆能坐五个人的汽车。