Please only native English speakers from the UK, USA, Canada, Australia, answer my question. I cannot accept replies from non-native English tutors or speakers. Thank you for understanding. Queries about two real sentences. 1a. Not something you will be getting until you managed to level up a fair bit. 1b. Not until will you be getting something until you managed to level up a fair bit. 1c. you will be getting something after you managed to level up a fair bit. Question: Which is grammatically correct? Do they have the same meaning? 2a. Bob visited his aunt before he left for Chicago. 2b. Bob visited his aunt before he had left for Chicago. 2c. Bob had visited his aunt before he left for Chicago. 2d. Bob had visited his aunt before he had left for Chicago. Question: Which is grammatically correct? Do they have the same meaning?