Take another look at the sentence:

After you eat tuna salad from the campus cafeteria, not only will your stomach rumble, but you will also sneeze for hours from the generous addition of MSG.

When you use not only ... but also, you must maintain parallel structure. Your stomach will rumble, a main clause, follows not only, so you will sneeze ..., another main clause, is correct after but also.

Go to the next sentence.

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