这两个英文中常见的语法现象，在形式上相似，但用法及意义却大相径庭。被动语态表示被动含义，结构为：S+be+V-ed；而系表结构用于表达某个事物的属性，结构为：S+be+adj.。
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第1个回答 2012-06-25
被动语态表示动作的被执行或承受；而系表结构表示主语的特点，性质或状态
过去分词由too，very，so， much等修饰
e.g. She was so shocked that she couldn’t say a word.
过去分词为表示心理，感情，处所等
e.g. He is lost in thoughts.
The school is located in the center of the city.
过去分词为表示 “必然性，趋势性，意向决心等
e.g. The boy is determined to get the book.
过去分词由too，very，so， much等修饰
e.g. She was so shocked that she couldn’t say a word.
过去分词为表示心理，感情，处所等
e.g. He is lost in thoughts.
The school is located in the center of the city.
过去分词为表示 “必然性，趋势性，意向决心等
e.g. The boy is determined to get the book.
第2个回答 2019-03-20
he
is
a
boy
.
系表结构是说明主语的状态，职位等。
系动词后是形容词，名词等
被动是动词的被动式!
the
work
is
being
done
.
is
a
boy
.
系表结构是说明主语的状态，职位等。
系动词后是形容词，名词等
被动是动词的被动式!
the
work
is
being
done
.
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