I've already written a fair chunk of the article.

我已写出文章的大部分。

《牛津词典》

While many teenagers are struggling to write articles for their exams, Jin Minzhe has already written a whole book.

在很多青少年还在艰难地写着考试作文时，金旻哲已经写了一整本书。

youdao

If you have one already written, so much the better.

若有已写成之书更佳。

youdao

Harrison thanked him, but said he already had written his speech.

VOA: special.2009.01.29

And instead of this continual anticipation of writing something great, Milton's able to look back and find closure in something already written.

他并没有继续着写一些伟大的作品，而是追溯了过去，并在已完成的作品中寻找着终结。

耶鲁公开课 - 弥尔顿课程节选

because someone has already written it or someone has already thought of it.

因为有人已经写过了，或者有人已经思考过了。

抄袭是很严重的问题 - SpeakingMax英语口语达人

The band has already written 12 songs for what will be its sophomore album.

NPR: White Light Riot: 'Charlatan'

The organisaton had already written to Home Secretary David Blunkett calling for an amnesty and transitional arrangements to save the taxpayer a homelessness bill.

BBC: Asylum seekers from new EU countries no longer get support

Kennedy had already written a draft majority opinion in the case.

NEWYORKER: Money Unlimited