是The building is fell down还是The building fell down?为什么?

是The building is fell down还是The building fell down?为什么? the building fell down ___(terrible) After ___ for a while,the whole building fell down fell down the ground 还是 fell to the ground 为什么字典上有句子是he fell down from the bike,有的是the tears fell down fell down 与fell to的区别 比如 Fell down the ground 与 fell to the fell down fell down on the sofa意思! And The House Fell Down 歌词 fell down 还是 fell off..摔倒. But she did mot go down the hole,she fell.She fell down,down The cat ______after it fell from the building