open既可以作动词,也可以作形容词

Open the door。

open a shop (动词)

The door is open。(形容词,表示状态)

The door was opened。(动词,表示动态)

close既可以作动词,也可以作形容词、副词、名词。

They are close friends。(形容词)

We live close to school。(副词)

at the close of the meeting(名词)

Close the door。(动词)

The door is closed。

  (closed本身可以作形容词,表示状态;也可以理解为过去分词,表示被动语态)

见过in a/one word简言之,总之,一句话

in the world在世界上

around the world

all over the world(遍及)全世界。

你说的都看不懂,什么叫be open close 和open close? 晕,没听说过。

什么叫in the word? around the word....? 你是不是想说world?晕。