be动词过去时加doing吗

be动词过去时加doing吗

be动词过去式后面不加doing，而是直接用动词的过去式表示被动语态。当表示过去进行时的时候，是be动词的过去式后面加doing。

在英语语法中，be动词意思和用法很多，一般的意思是：是，此种用法，有多种变化形式，is，am，are，was，were，being，been，to be.另外，be动词还有成为的意思。根据句子中不同的人称、数和时态，应该选择相应的be动词。

例句对照：
1.当做主动词时，“be”在性质上属于接系动词(The Linking Verb), 后面要有名词、形容词、地方副词或短语作补足语(The Complement)。例如：

The man is a science teacher.
Mary's new dresses are colourful.
I have been there before.
My motheris in the kitchen now.

2.“事/物人 +Be + 过去分词”以组成被动语态(The Passive Voice),如：
Her money in the drawer was stolen.
A number of good jobs are taken up by foreigners.
David studied in Taiwan but hasbeen trained as a language lecturer in America.
Can all the wonderful birds be found in our Bird Park.
The disobedient boywas told to stand out- side the classroom.
Steps are being taken to reduce traffic con- gestion during peak hours.
Dishonest students will be immediately dealt with.

只能接动词-ing形式作宾语的动词： 建议冒险去献身，忍受期待不停顿；放弃延期悔失去，坚持欣赏实践成；注意原谅避反对，考虑要求不自禁；允许习惯不介意，价值开始想动名。 只接动词-ing形式而不接不定式作宾语的动词有：admit 承认 appreciate 感激 avoid 避免 put off 推迟 keep 保持 consider 考虑 delay 耽搁 dislike 嫌恶 resist抵制 mention 提及 enjoy 喜欢 escape 避免 excuse 原谅 practice 练习 mind介意 fancy想不到 feel like 意欲 finish 完成 risk 冒险 include 包括 forgive 原谅 give up 放弃 suggest 建议 miss 逃过 imagine 设想 cannot help 情不自禁

过去进行时，是be动词的过去时加doing.如： We were reading then. He was writing a letter when I saw him.