at present technology is developing fast that tall building is being pulled down
问题描述：
at present technology is developing fast that tall building is being pulled down
为什么加ing啊,而不是用ed 不是被动关系吗
第二个能不能直接is pulling down啊being在这是啥用法啊.
答
develop 这个单词没有被动形式,没有被发展这个说法,所以不可以用ed
is being pulled down 是现在进行时的被动语态 be + being+过去分词,你可以写成 is pulled down 但不可以写成being pulled down