Both sentences are fine.
In both sentences, "after" means "later than." It's not really a substitute for "in," which implies "within."
Thank you for your help.
1. He will be back after a few days.
2. He was back after a few days.
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In the past tense, do we have to use 'after' as in Sentence 2?
What about Sentence 1? I used 'after' instead of 'in.' Is this sentence grammatical? Do we have to substitute 'in' for 'after'?
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