1
be posted (adj.)
作形容词，表示‘已公布的、已张贴的’，通常不用于进行时。
The notice is posted on the bulletin board.
通知已经张贴在公告栏上。
贴出；布置；派遣
先理解核心含义，再看它在真实句子里的用法。
贴出；布置；派遣
put up (as a notice) or assigned to a duty
The notice is posted on the bulletin board.
通知已经张贴在公告栏上。
post的过去分词
贴出；布置；通告(post的过去分词)
a. publicly announced
post
Base
原形
posts
3rd person
第三人称单数
posting
-ing
现在分词
posted
Past
过去式
posted
Past participle
过去分词
He posts letters every day.
他每天寄信。
She posted the notice yesterday.
她昨天贴了通知。
They have posted the results.
他们已经公布了结果。
规则动词，过去式和过去分词均为posted。
The schedule is posted on the bulletin board.
时间表已张贴在公告板上。
The rules are posted at the entrance.
规则已公布在入口处。
The notice was posted yesterday.
通知已于昨天张贴。
作形容词，表示‘已公布的、已张贴的’，通常不用于进行时。
The notice is posted on the bulletin board.
通知已经张贴在公告栏上。
现在完成时主动态，强调动作已完成。
She has posted the letter this morning.
她今天早上已经把信寄出了。
被动语态，强调动作的承受者。
The results were posted on the website by the committee.
结果由委员会公布在网站上。
Not this
The schedule posted on the website.
Use this
The schedule is posted on the website.
中文学习者常省略be动词，因为中文中‘张贴’可以直接作谓语。英语中过去分词作形容词表示状态时必须搭配be动词。
Not this
The notice is posted in the wall.
Use this
The notice is posted on the wall.
中文的‘在墙上’用‘在’概括，但英语中与post（张贴）搭配的介词通常是on，表示附着于表面；in则表示内部，不符合实际意义。
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post的过去分词，常用作形容词表示‘已公布的’
Dictionary facts from ECDICT.