英语语法结构之系动词（一）
英语除动词be之外，还有一些动词也可以作系动词，如表示状态或情况的：keep,look,feel,appear,lie,remain,seem,stay,smell,sound,taste等；以及表示变化的：get,grow,turn,fall,run,become,go等。下面我们来分析一下带系动词的句子结构。
1.系动词后面带名词从句
Good manners are the happy way of doing things.
It seemed to him that he had never worked so hard in his life.
2.系动词后面带形容词
She sounded rather surprised on the phone.
Sit down.Just stay calm and you will be alright.
3.to be 可以加在seem,prove,remain,appear等系动词和其后的名词或形容词之间，但也可以省略。
The task proved (to be) impossible.
They seem (to be) such friendly people,but they never replied to our invitation.
What has happened remains (to be) a mystery.
The problem first appeared (to be) unsolvable,but later we came up with a very good solution.
注意：在seem,appear等词后，可加其他非 to be 的不定式，但这时，它们则不是系动词而是不及物动词。
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