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open是什么意思 过去式的技巧是什么?

来源:中国科商网  

1、“open”的意思是:adj.敞开的,开着的;公开的,公共的;坦率的;有议论余地的。vt.&vi.(打)开;开始;睁开;启动。n.公开;户外,野外;空旷。vi.使打开;展示,显现。vt.开放;张开;开张营业;为(建筑物)揭幕。

2、“open”的动词形式:第三人称单数:opens;现在分词:opening;过去式:opened;过去分词:opened。

一变:肯定句变为否定句

【技巧1】当句中含有情态动词或助动词could,would,should等时,可直接在其后面加not构成否定句。例如:

I could get you a concert ticket. → I could not / couldn't get you a concert ticket.

【技巧2】当句中含有系动词was,were 时,可直接在其后加not构成否定句。例如:

I was on the Internet when you called me. → I was not / wasn't on the Internet when you called me.

【技巧3】当句中谓语是除情态动词、助动词、系动词was,were以外的动词时,在该动词之前加did not / didn't,动词还原,构成否定句。例如:

The famous singer sang some Chinese songs. → The famous singer did not / didn't sing any Chinese songs.

二变:陈述句变为一般疑问句

【技巧1】移动词语的位置。将was,were,could,would,should等移到句首。例如:

He could pack his things himself. → Could he pack his things himself?

【技巧2】添加助动词did。谓语是除情态动词、助动词、系动词was,were以外的动词时,在主语之前加did,动词还原。例如:

Mr Li looked very old. → Did Mr Li look very old?

三变:陈述句变为特殊疑问句

【技巧1】确定疑问词:人who / whom,物what,地点where,时间when / what time,原因why,频率how often,长度how long,距离how far等等。例如:

They gave the concert last night. → When did they give the concert?

【技巧2】辨认结构形式:疑问词+情态动词/助动词/ was / were / did +主语+...? 例如:

The accident happened near the station. → Where did the accident happen

一些不规则变化:

do>did see>saw make>made take>took eat>ate

read>read put>put get>got hear>heard feel>felt

is/am---was are---were teach---taught catch---caught

buy---bought go---went come---came become---became等

关键词: open是什么意思 过去式技巧 过去式用法 过去式用途 过去式价值 过去式作用

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