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I had to translate a question from Russian into English, i did it: “How many years is your sister younger than you?” My teacher’s corrected it into: “FOR how many...?” Is his correction right?

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    No, your teacher is wrong. A less awkward way of expressing your question is *How many years younger than you is your sister?" – StoneyB Feb 15 '18 at 19:40
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To follow up on @StoneyB's comment -- "for how many years" is measuring the duration of an event; it's not comparing two values.

For example, we can say, "Barack Obama was President of the USA for eight years", or "The Martian was the best-selling book for three weeks". In both of those cases, "for" is required; the sentences don't make sense without it.

The question "for how many years has your sister been younger than you?" is grammatically correct, but it's kind of absurd. If your sister is younger than you, she has been younger for her entire life!

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