the builders are busy build tall buildings.改错

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• the builders are busy build tall buildings.改错
• The builders are busy build tall buildings.(改错）
• the ---are ---a tall---.(a.builder,building,building b.builders,build,building c.builders,building,b
• the builders are busy build tall buildings.改错
• They can help build roads and construct tall buildings.
• The builders are busy build tall buildings.(改错）
• the ---are ---a tall---.(a.builder,building,building b.builders,build,building c.builders,building,b
• be的过去分词been的问题I have been very busy the last few days与I have always been in love with you.这俩句话have been后面跟的不是现在完成进行时(have been doing)的结构,也不是现在完成时（have been done)的结构.而且动词不定式的完成时也是（to have been made）.那么这俩句话have been后面跟的却是busy和love的原型.为什么会有have been+动词原形的结构?如果就是单纯的把be变成been的话,那么请问它在我们学习的那一个知识点中呢?
• sing和pick的ing和复数和过去式