Well,can you imagine how the world would look like if nobody took out the trash?
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No because you can't say 'how the world would like". Why do you ask?– BillJDec 29, 2019 at 18:23
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1You have to choose between how it looks or what it looks like (as with That's how it is and That's what it looks like).– FumbleFingersDec 29, 2019 at 18:51
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did not understand you– Sami BadrDec 29, 2019 at 19:31
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Note that "what the world would look like if nobody took out the trash" is an interrogative clause (embedded question). The meaning is "Can you imagine the answer to the question 'What would the world would look like if nobody took out the trash?'"– BillJDec 29, 2019 at 19:32
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Like is a preposition; it takes a noun. In your sentence, what functions as a substitute for the noun. What would the world look like? — The world would look like a huge dump (for example). How can function as a substitute for an adverb. Since like is a preposition, the construction like X can be considered an adverbial phrase (see). Therefore, to use how in your sentence, you'd have to replace the whole like phrase with it: How would the world look? — The world would look like a huge dump.– athlonusmDec 29, 2019 at 19:50