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

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

是The building is fell down还是The building fell down?为什么?
The building fell down.
fell是实义动词,直接就可以当谓语动词.
如果实义动词前加is ,那么动词不是现在进行时(动词加ing)就是被动语态(动词过去分词)