The letter was finished.

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I've just finished writing a letter.

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Have you finished writing the letter yet?

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She finished writing a letter.

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I've finished writing the letter.

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Have you finished writing your thesis?

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I finished writing the letter by noon.

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I didn't finish my homework today, either.

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I had just written the letter when he came back.

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In any case, I've finished writing the article.

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Finish your homework faster, so that we can play video games.

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Quickly finish up your homework, and apologise to your teacher tomorrow!

Source: Tatoeba