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1)The quest of finding methods of expression that is authentic to oneself open up doors

2)The quest of finding methods of expression that is authentic to oneself opens up doors

Justin
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2 Answers2

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Neither is correct. "The quest of finding methods of expression that are authentic to oneself opens up doors" would be grammatical.

"Quest" is a singular noun: "The quest opens up doors". "Methods" is a plural noun: "Methods that are authentic".

The other answer suggests using "The quest of finding methods of [expression that is authentic to oneself] opens up doors", where "that is authentic to oneself" is taken as a relative clause modifying "expression". That is technically a possible structure for the sentence, and the use of "is authentic..." is correct for that structure, but it doesn't sound natural to me at all.

herisson
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The second one is correct.

In

The quest opens up doors.

the verb opens up agrees in person and number with the subject quest.

The sentence doesn't require are if both the prepositional phrase

of finding methods of expression

and the restrictive relative clause

that is authentic to oneself

refer to the noun quest.

The meaning of the sentence is that that quest which consists of finding methods of expression and that it is also, or it happens to also be, authentic to oneself, opens up doors.