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,

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Thenewbikehadbeenputinplaceofmyoldbike.中的put为什么用原形啊?have/hadbeen+doing,Thenewbikehadbeenputinplaceof

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,
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,

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,
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.