Table: episode_details_3
Columns: no_in_series
no_in_season
title
directed_by
written_by
original_air_date

Question: When 129 is the number in the series who is the writer?
SQL: SELECT "written_by" FROM episode_details_3 WHERE "no_in_series" = 129

Question: When "past tense" is the title who is the writer?
SQL: SELECT "written_by" FROM episode_details_3 WHERE "title" = '"Past Tense"'