一、若看做一个词,那么open是原型,opening和opened分别是现在分词和过去分词,三个都是动词（verb,v.）
二、open：形容词 a.
1.打开的
My door is always open to visitors.
我的门永远向来访者敞开.
2.开阔的,空旷的[B]
In front of us we saw a stretch of open fields.
我们看到在我们的身前是一片开阔的田野.
3.敞开的,开着的;无顶的
4.悬而未决的,未定的
This is still an open question.
这仍然是一个尚未解决的问题.
5.营业的,办公的;出入自由的[F]
Is the store open from 9 to
那家商店是从上午九点营业到晚上七点吗?
6.(工作、职位)空缺的[F]
The position is still open.
那个职位仍空缺着.
7.公开的,公然的,不隐晦的
It's an open secret that his firm is going bankrupt.
他公司即将破产一事已是公开的秘密.
8.开放的,可以自由参加的[(+to)]
That's an open society.
那是一个开放的社会.
9.【语】(元音、音节)开的
10.愿意接受的;易招致...的[F][(+to)]
They are open to temptations.
他们容易受诱惑.
I am open to suggestions.
我愿意接受各种建议.
及物动词 vt.
1.开;打开
I opened the window after I got up.
我起床后便把窗子打开.
2.铺开,展开
3.开始
The Conference was opened on October 15.
大会于十月十五日开始.
4.使开张(营业)
He opened a grocery store last month.
上个月他开了一爿杂货铺.
5.使畅通
不及物动词 vi.
1.开;张开;展开
The flowers are opening.
花正在开放.
2.开始
The fair opened on March 17.
交易会于三月十七日开幕.
3.开业
4.展现
A great future opens before them.
远大的前程展现在他们面前.
名词 n.
1.户外,野外[the S]
We spent that night in the open.
那夜我们在野外度过.
2.旷野,空地[the S]
3.【体】公开赛
opening：名词 n.
1.开始;开头;开会[C][U]
The official opening of the store will take place next week.
这家店下周正式开张.
2.开始的部分;(戏剧的)首演[C]
The book's opening is dull,but the last chapters are interesting.
那本书的开始部分枯燥乏味,但最后几章很有意思.
3.穴,孔;通道[C]
There was an opening in the wall.
墙上有个洞.
4.(林中)空地[C]
5.(职位的)空缺[C]
There are two openings in the office.
那家办事处有两个空缺.
6.机会,好时机[C]
good openings for business
做生意的大好时机
形容词 a.
1.开首的,开始的[B]
My family and friends came to the opening night of my play.
我的家人和朋友出席了那晚我的话剧的首场演出.
opened：v.开启(公开,开证)
adj.开的
This lock can only be opened from the inside.
这把锁只能从里面打开.
She opened her eyes wide in mock disbelief.
她睁大眼睛假装不相信.
When the play opened,the local press gave it the thumbs down.
这出戏公演时,当地报纸对它评价不佳.
The door opened inward into the room.
门是朝房间里面开的.
The door opened outwards.
这门是朝外开的.
The office mail is opened in the morning.
公务信件在早晨开启.
Supposing we opened (open) the L/C this afternoon.
我们今天下午就开证吧.
I reached the gate that opened onto the lake.
我走到临湖而开的那扇门前.
