Sarah asked me that if I was still a member of sports centre.
The correct answer to the given question is explained below,
Sarah asked me, "Are you still a member of the sports centre?"
Because Sarah was asking me she would have used "Are" if she asked about anyone else from me then she will say "Is"
After the word "Are" "You" is written because Sarah will need to explain as to about whom is she taking or asking so that is why the word "You" is written after "Are"
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