adverb
used to emphasize a statement or to express a contrast
preposition
used to indicate that something happens or is true despite what was said or expected
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It is important to consider all aspects of the project before making a decision, after all.
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I think we should go to the beach today, after all, the weather is nice.
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I'm gonna treat myself to some ice cream, after all, I deserve it.
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Life is full of ups and downs, but we must remember to keep moving forward after all.