请教一下怎样把They have built many tall buildings.改成被动语态 Many tall

请教一下怎样把They have built many tall buildings.改成被动语态 Many tall 把下列句子改为被动语态.1、They have built many tall buildings . Many tall buildings have been built up here since 2003这句话什么意 Have many tall buildings been built by them in their hometow In the past twenty years,many tall buildings have been built Many tall buildings have been built in our city .the tallest Were there many tall buildings? There are so many tall buildings in Shanghai.把这句改成感叹句 they have put up many tall buildings there years 的put up many tall buildings的意思是什么 There are many tall buildings in our(? There are many buildings in the world.They are tall or short