It's a casual idiom. I hadn't taken two swallows when I began to throw up! He hadn't walked half a block before he changed his mind.
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Terri AmadorSentence #2 is wrong because the use of FOR here suggests DURATION, which we commonly use in the PRESENT PERFECT to express that an action or condition started in the past and continues to the present.Dinosaurs had roamed the Earth for centuries before climate change finally caused their extinction.
Anonymous1. Tom had not studied in Japan two weeks before he got homesick.I believe Tara-sensei's example is about English idioms.
2. Tom had not studied in Japan for two weeks before he got homesick.