What is the correct and more-native position of the word 'are' in the following sentences?
*someone asked me what are my plans for halloween
*someone asked me what my plans for halloween are
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 * Someone asked me [what are my plans for Halloween].
 Someone asked me [what my plans for Halloween are].
The position of “are” has an important effect on the grammaticality.
The bracketed elements are subordinate interrogative clauses (embedded question). Such clauses do not normally have subject-auxiliary inversion, and hence  is fine but , which does have inversion, is ungrammatical.
The meaning of  can be glossed as “Someone asked me the answer to the question ‘What are my plans for Halloween?’”