Adjectives are words that describe a noun. "Reasonable" is an adjective. The word to go in the blank space is describing the noun "prices" so you would use an adjective to act upon a noun, in this case "reasonable". "Reasonably" is an adverb. Adverbs act upon verbs. If the blank were in front of " keeps" then "reasonably" could work there. We know the blank in the question will be an adjective because "keep prices" by itself sounds incomplete and unnatural. What would it mean to keep prices? So we usually say "keep prices (adjective)".
@asousek So an adjective here modifies(complements?) a noun "prices" after that! Yeah the word order looks kinda tricky to me, but it's good to know that "keep something" looks imcomplete to natives! The structure with an adverb must look weird to natives... That really helps! Thank you 😆
@asousek That's interesting! Yeah there seems to be the rule of the word order like that. I think natives just feel strange to see wrong word order. But I don't really get that intuitively yet😅 I guess "sound" is pretty important to get used to English.
Yeah, there are a lot of phrases that just sound right and we don't know why. I was trying to figure out why this adjective goes behind prices instead of in front. You could technically do either "keep reasonable prices" and "keep prices reasonable" but they seem to be used in slightly different cases.
@asousek I guess the first one is that there are specific prices that are considered reasonable and they keep that. And the latter maybe more like they provide products whose prices reflect market needs. I'm not sure though😅 Yeah I found that it's hard to improve my English without getting used to sound in English. So I often watch American shows like "The Office". I hope it will work!
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