Why not use “which” instead of “what“? —-> He pulled the cloth off what looked like a pie.”

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"What" is an interrogative pronoun while "which" may be used as interrogative pronoun or a relative pronoun. In the sentence "He pulled the cloth off which looked like a pie.", "which" is a relative pronoun used as the subject of the relative clause "which looked like a pie". This relative clause is used as an adjective clause modifying the noun "cloth". Better say "He pulled the cloth which looked like a pie off." or "He pulled off the cloth which looked like a pie."

  • To put it simply, you can't (use "which" instead of "what") in this sentence. In "He pulled the cloth off what looked like a pie", the dependent clause "what looked like a pie" is the object noun. If you replace "what" with "which", the dependent clause "which looked like a pie" is an adjective phrase, not an object noun. You'd have to include an object noun before "which" in order to make a proper sentence. The result would be "He pulled the cloth off the ________ which looked like a pie" (and "which looked like a pie" would describe the missing word "_______").

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