The new bike had been put in place of my old bike.中的put为什么用原形啊?

分类: 作业答案 • 2022-04-06 10:55:23

问题描述：

The new bike had been put in place of my old bike.中的put为什么用原形啊?
have/had been+doing,

答

这里的put是过去分词,have been put 被放置,be动词后面跟过去分词,假如加现在分词doing的话是表示主动.
put的过去式和过去分词形式是一样的.