Questions & Answers about Çantada taşıması gereken pompa ağır değil.
How exactly does taşıması gereken pompa mean "the pump she must carry"?
This structure uses the verbal noun suffix -ma plus a possessive ending to show who has to do the action. Here, taşı-ma-sı literally means "her carrying". We then add gereken (which is necessary) and the noun pompa (pump). Put together, it translates literally as "the pump for which her carrying is necessary."
Since Turkish doesn't have gendered pronouns, how do we know it means "she must carry" and not "he must carry"?
You are right to ask! The third-person possessive suffix -sı in taşıması can mean his, her, or its. We translated it as "she" here for convenience, but without more context, it could equally mean "the pump he must carry." To be totally unambiguous, you could add the pronoun onun before taşıması.
Why is çantada placed at the very beginning of the sentence?
Çantada (in the bag) tells us where the carrying happens, so it modifies the verb taşımak. In Turkish, all the details belonging to an action must come right before it. Therefore, çantada gets bundled into the relative clause block, creating the unified phrase çantada taşıması gereken (that she must carry in the bag).
Could I just use zorunda or lazım instead of gereken to say "must carry" here?