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We watch the sun set from the lip of the canyon, overlooking a rectangular structure that looks everything like an ancient apartment building.

1. Is the sentence above grammatical and natural-sounding?

2. Is "everything" used as an adverb?

3. If everything is used as an adverb, what does everything modify? like or looks?

I think the sentence is grammatical and everything is used as an adverb modifying the verb looks.

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fire1

We watch the sun set from the lip of the canyon, overlooking a rectangular structure that looks everything like an ancient apartment building.

1. Is the sentence above grammatical and natural-sounding?
[It seems natural enough.]

2. Is "everything" used as an adverb?
[ I would say so. It's actually a pronoun so it creates a noun phrase, but it functions like an adverb does. ]

3. If everything is used as an adverb, what does everything modify? like or looks? [ "like". It would be the same if it were "completely like", where "completely" is even more clearly modifying "like". ]

CJ

Comments  
fire11. Is the sentence above grammatical and natural-sounding?

"Everything" is not natural. Use "for all the world" or "just" or "in all respects" or one of a dozen alternatives.