Past perfect (+) s + had + V3 / V ed + c + M s + had + not + V3 / V ed + c + m (?) Had + s + V3 / V ed + c + M?

S + V + WHETHER OR NOT + S + V + C + M
S + V + WHETHER / IF + S + V + C + M + OR NOT
e.g. Have you finished copying or not?
She was asked whether or not she had finished copying?
She was asked whether / if she had finished copying or not?
Were you chatting to each other?
The teacher wanted to know whether or not they were chatting to each other?
Can you help me or not?
Tim asked whether / if I could help him or not.


TENSE CHANGE IN EMBEDDED SENTENCES

Original version	Changed version
Present Simple Do you eat meals without heating? Why does she always do the things that she wants?	Past Simple I asked him if he ate meals without heating. Brain explained me why she always did the things that she wanted.
Present Continuous Are you preparing hard for the final quiz? What is John doing as a part-time job?	Past Continuous The tutor asked us if we were preparing hard for the final quiz. His friend inquired me what John was doing as a part-time job.
Present Perfect Has a shortage of water been prevented in the city? Where have you submitted application documents?	Past Perfect The reporter asked the governor whether or not a shortage of water had been prevented in the city. He asked me where I submitted my application documents.