以称之为静动句的混合体。静句是用来描写事物的性质或状态的。动句是用来描写动作及动作过程。由于在表达形式上这两种结构是一样的，都由be +ed分词构成，这样就给区别系表结构和被动语态带来了麻烦。现将几种区别方法归纳如下：
一.从动词的性质来区分
英语中的不及物动词不用于被动语态。但是，不及物动词的过去分词可以和动词be连用构成系表结构。在这个结构中，过去分词只表示动作已经完成。强调事物的状态。常见的这种形式不及物动词有：gone，come， arrived，fallen，retired，startled，vexed，mistaken等。这些不及物动词都具有描述性质。例如：
Her fever is gone，but she still feels weak.
I shall be vexed if you keep mentioning it.
The interviewer was quite mistaken about the incidents which happened in the campus.
注意：如果构成分词的动词是一个持续性动词，不表示终极界限，不表示动作结果，而强调动作的持续性，在这种情况下谓语大多数是被动语态。例如：
All the books were carried to the library.
Several students were honoured for their excellent performance in the English contest.
二.从句子表达的内容来区分
被动语态表示动作，句子的主语是动作的承受者;系表结构中的过去分词已基本上失去了动词的意义，只起到一个形容词的作用，在句子中作表语，说明主语的性质，或所具有的特征或所处的状态。例如：
The houses were beautifully decorated.(系表)
The houses were decorated and rented to those who were badly in need of shelters.(被动)
The book is not illustrated.(系表)
The book was illustrated by a famous artist.(被动)
注意：在现代英语中，有少数从古英语中遗留下来的只能用作形容词的-ed分词。这种分词形容词特性显著，完全起到了形容词作用。例如：
amused， broken，closed，confused， crowded，covered，done，delighted，frightened， bent， blessed，bound，drunk，lit，melted，rotten， shaved，shrunk，sunk，believed， burnt，excited， faded，married，interested，pleased，satisfied，surprised等。
三.从-ed分词后所跟的介词来区别
作形容词用的-ed分词在个别情况下，可以跟除by-phrase以外的其他介词。如： about，at，in，on，with，over，to等。例如：
I’m interested in my own hobbies，such as collecting stamps，raising birds and fishing.(系表)
I was interested by what you showed me.(被动)
The people present at the meeting were annoyed with the tedious speech.(系表)
The people who wanted to attend the meeting were surprised by the announcement of the adjournment without day.(被动)
